20907564740520 has 64 divisors (see below), whose sum is σ = 62802392973120. Its totient is φ = 5568266264064.

The previous prime is 20907564740519. The next prime is 20907564740521. The reversal of 20907564740520 is 2504746570902.

It is an interprime number because it is at equal distance from previous prime (20907564740519) and next prime (20907564740521).

It is not an unprimeable number, because it can be changed into a prime (20907564740521) 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, 110597877 + ... + 110786756.

It is an arithmetic number, because the mean of its divisors is an integer number (981287390205).

Almost surely, 2^{20907564740520} is an apocalyptic number.

20907564740520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20907564740520 is an abundant number, since it is smaller than the sum of its proper divisors (41894828232600).

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

20907564740520 is a wasteful number, since it uses less digits than its factorization.

20907564740520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221385434 (or 221385430 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 20907564740520 in words is "twenty trillion, nine hundred seven billion, five hundred sixty-four million, seven hundred forty thousand, five hundred twenty".