20451890920772 has 24 divisors (see below), whose sum is σ = 35799483256320. Its totient is φ = 10223467440480.

The previous prime is 20451890920757. The next prime is 20451890920777. The reversal of 20451890920772 is 27702909815402.

It is not an unprimeable number, because it can be changed into a prime (20451890920777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362163683 + ... + 362220149.

It is an arithmetic number, because the mean of its divisors is an integer number (1491645135680).

Almost surely, 2^{20451890920772} is an apocalyptic number.

It is an amenable number.

20451890920772 is a deficient number, since it is larger than the sum of its proper divisors (15347592335548).

20451890920772 is a wasteful number, since it uses less digits than its factorization.

20451890920772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76811 (or 76809 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 20451890920772 in words is "twenty trillion, four hundred fifty-one billion, eight hundred ninety million, nine hundred twenty thousand, seven hundred seventy-two".