20400767372644 has 24 divisors (see below), whose sum is σ = 35723417194080. Its totient is φ = 10194077672064.

The previous prime is 20400767372633. The next prime is 20400767372717. The reversal of 20400767372644 is 44627376700402.

It is a junction number, because it is equal to n+sod(n) for n = 20400767372591 and 20400767372600.

It is an unprimeable number.

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, 93833607 + ... + 94050769.

It is an arithmetic number, because the mean of its divisors is an integer number (1488475716420).

Almost surely, 2^{20400767372644} is an apocalyptic number.

It is an amenable number.

20400767372644 is a deficient number, since it is larger than the sum of its proper divisors (15322649821436).

20400767372644 is a wasteful number, since it uses less digits than its factorization.

20400767372644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231579 (or 231577 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 52.

The spelling of 20400767372644 in words is "twenty trillion, four hundred billion, seven hundred sixty-seven million, three hundred seventy-two thousand, six hundred forty-four".