20672268657 has 16 divisors (see below), whose sum is σ = 27774959040. Its totient is φ = 13675776192.

The previous prime is 20672268571. The next prime is 20672268671. The reversal of 20672268657 is 75686227602.

It is not a de Polignac number, because 20672268657 - 2¹⁴ = 20672252273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20672268677) 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, 335694 + ... + 392472.

It is an arithmetic number, because the mean of its divisors is an integer number (1735934940).

Almost surely, 2^20672268657 is an apocalyptic number.

It is an amenable number.

20672268657 is a deficient number, since it is larger than the sum of its proper divisors (7102690383).

20672268657 is a wasteful number, since it uses less digits than its factorization.

20672268657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57712.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 20672268657 in words is "twenty billion, six hundred seventy-two million, two hundred sixty-eight thousand, six hundred fifty-seven".