20620240 has 40 divisors (see below), whose sum is σ = 48387528. Its totient is φ = 8171520.

The previous prime is 20620231. The next prime is 20620241. The reversal of 20620240 is 4202602.

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 20575296 = 212^2 + 4536^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7900 + ... + 10180.

Almost surely, 2^20620240 is an apocalyptic number.

20620240 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 20620240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24193764).

20620240 is an abundant number, since it is smaller than the sum of its proper divisors (27767288).

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

20620240 is a wasteful number, since it uses less digits than its factorization.

20620240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407 (or 2401 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20620240 is about 4540.9514421539. The cubic root of 20620240 is about 274.2192288839.

Adding to 20620240 its reverse (4202602), we get a palindrome (24822842).

The spelling of 20620240 in words is "twenty million, six hundred twenty thousand, two hundred forty".