20021566707 has 48 divisors (see below), whose sum is σ = 29924923392. Its totient is φ = 12892622400.

The previous prime is 20021566703. The next prime is 20021566813. The reversal of 20021566707 is 70766512002.

20021566707 is a `hidden beast` number, since 2 + 0 + 0 + 21 + 566 + 70 + 7 = 666.

It is not a de Polignac number, because 20021566707 - 2² = 20021566703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021566703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10665853 + ... + 10667729.

It is an arithmetic number, because the mean of its divisors is an integer number (623435904).

Almost surely, 2^20021566707 is an apocalyptic number.

20021566707 is a deficient number, since it is larger than the sum of its proper divisors (9903356685).

20021566707 is a wasteful number, since it uses less digits than its factorization.

20021566707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2245 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 20021566707 in words is "twenty billion, twenty-one million, five hundred sixty-six thousand, seven hundred seven".