20792307921 has 32 divisors (see below), whose sum is σ = 34571129856. Its totient is φ = 10798920000.

The previous prime is 20792307919. The next prime is 20792307931. The reversal of 20792307921 is 12970329702.

It is not a de Polignac number, because 20792307921 - 2¹ = 20792307919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20792307931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2095071 + ... + 2104971.

It is an arithmetic number, because the mean of its divisors is an integer number (1080347808).

Almost surely, 2^20792307921 is an apocalyptic number.

20792307921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20792307921 is a deficient number, since it is larger than the sum of its proper divisors (13778821935).

20792307921 is a wasteful number, since it uses less digits than its factorization.

20792307921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19013.

The product of its (nonzero) digits is 95256, while the sum is 42.

The spelling of 20792307921 in words is "twenty billion, seven hundred ninety-two million, three hundred seven thousand, nine hundred twenty-one".