20513472540 has 48 divisors (see below), whose sum is σ = 62659336320. Its totient is φ = 4972962880.

The previous prime is 20513472527. The next prime is 20513472541. The reversal of 20513472540 is 4527431502.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513472541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15539850 + ... + 15541169.

It is an arithmetic number, because the mean of its divisors is an integer number (1305402840).

Almost surely, 2^20513472540 is an apocalyptic number.

20513472540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513472540 is an abundant number, since it is smaller than the sum of its proper divisors (42145863780).

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

20513472540 is a wasteful number, since it uses less digits than its factorization.

20513472540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31081042 (or 31081040 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The spelling of 20513472540 in words is "twenty billion, five hundred thirteen million, four hundred seventy-two thousand, five hundred forty".