20601540 has 108 divisors (see below), whose sum is σ = 65304876. Its totient is φ = 5458752.

The previous prime is 20601533. The next prime is 20601547. The reversal of 20601540 is 4510602.

It is a happy number.

20601540 is a `hidden beast` number, since 20 + 601 + 5 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (20601533) and next prime (20601547).

It can be written as a sum of positive squares in 2 ways, for example, as 6718464 + 13883076 = 2592^2 + 3726^2 .

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20601547) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 131142 + ... + 131298.

Almost surely, 2^20601540 is an apocalyptic number.

20601540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20601540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32652438).

20601540 is an abundant number, since it is smaller than the sum of its proper divisors (44703336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20601540 is an equidigital number, since it uses as much as digits as its factorization.

20601540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20601540 is about 4538.8919352635. The cubic root of 20601540 is about 274.1363095373.

It can be divided in two parts, 2060 and 1540, that added together give a square (3600 = 60²).

The spelling of 20601540 in words is "twenty million, six hundred one thousand, five hundred forty".