20541440 has 104 divisors (see below), whose sum is σ = 53077680. Its totient is φ = 7602176.

The previous prime is 20541431. The next prime is 20541449. The reversal of 20541440 is 4414502.

It is an interprime number because it is at equal distance from previous prime (20541431) and next prime (20541449).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541449) 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, 348131 + ... + 348189.

Almost surely, 2^20541440 is an apocalyptic number.

20541440 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 20541440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26538840).

20541440 is an abundant number, since it is smaller than the sum of its proper divisors (32536240).

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

20541440 is an equidigital number, since it uses as much as digits as its factorization.

20541440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20541440 is about 4532.2665411469. The cubic root of 20541440 is about 273.8694744787.

Adding to 20541440 its reverse (4414502), we get a palindrome (24955942).

The spelling of 20541440 in words is "twenty million, five hundred forty-one thousand, four hundred forty".