20907987607 has 12 divisors (see below), whose sum is σ = 22840385184. Its totient is φ = 19128869760.

The previous prime is 20907987587. The next prime is 20907987637. The reversal of 20907987607 is 70678970902.

It is not a de Polignac number, because 20907987607 - 2¹⁵ = 20907954839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907987637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 528319 + ... + 566512.

It is an arithmetic number, because the mean of its divisors is an integer number (1903365432).

Almost surely, 2^20907987607 is an apocalyptic number.

20907987607 is a deficient number, since it is larger than the sum of its proper divisors (1932397577).

20907987607 is a wasteful number, since it uses less digits than its factorization.

20907987607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094970 (or 1094957 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 20907987607 in words is "twenty billion, nine hundred seven million, nine hundred eighty-seven thousand, six hundred seven".