20961908307 has 24 divisors (see below), whose sum is σ = 30592261440. Its totient is φ = 13830450480.

The previous prime is 20961908263. The next prime is 20961908333. The reversal of 20961908307 is 70380916902.

20961908307 is a `hidden beast` number, since 20 + 9 + 619 + 0 + 8 + 3 + 0 + 7 = 666.

It is not a de Polignac number, because 20961908307 - 2¹² = 20961904211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20961903307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309088 + ... + 370754.

It is an arithmetic number, because the mean of its divisors is an integer number (1274677560).

Almost surely, 2^20961908307 is an apocalyptic number.

20961908307 is a deficient number, since it is larger than the sum of its proper divisors (9630353133).

20961908307 is a wasteful number, since it uses less digits than its factorization.

20961908307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62063 (or 62060 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 20961908307 in words is "twenty billion, nine hundred sixty-one million, nine hundred eight thousand, three hundred seven".