20792405890 has 16 divisors (see below), whose sum is σ = 37437831360. Its totient is φ = 8314406640.

The previous prime is 20792405861. The next prime is 20792405897. The reversal of 20792405890 is 9850429702.

It is a self number, because there is not a number n which added to its sum of digits gives 20792405890.

It is not an unprimeable number, because it can be changed into a prime (20792405897) 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 7 ways as a sum of consecutive naturals, for example, 285120 + ... + 350539.

It is an arithmetic number, because the mean of its divisors is an integer number (2339864460).

Almost surely, 2^20792405890 is an apocalyptic number.

20792405890 is a deficient number, since it is larger than the sum of its proper divisors (16645425470).

20792405890 is a wasteful number, since it uses less digits than its factorization.

20792405890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638937.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20792405890 in words is "twenty billion, seven hundred ninety-two million, four hundred five thousand, eight hundred ninety".