20011525440 has 56 divisors (see below), whose sum is σ = 63536596320. Its totient is φ = 5336406528.

The previous prime is 20011525427. The next prime is 20011525463. The reversal of 20011525440 is 4452511002.

It is a super-2 number, since 2×20011525440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20011525440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10421710 + ... + 10423629.

Almost surely, 2^20011525440 is an apocalyptic number.

20011525440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011525440 is an abundant number, since it is smaller than the sum of its proper divisors (43525070880).

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

20011525440 is a wasteful number, since it uses less digits than its factorization.

20011525440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20845359 (or 20845349 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 20011525440 in words is "twenty billion, eleven million, five hundred twenty-five thousand, four hundred forty".