20750388644457 has 24 divisors (see below), whose sum is σ = 30082918884096. Its totient is φ = 13782767171616.

The previous prime is 20750388644443. The next prime is 20750388644459. The reversal of 20750388644457 is 75444688305702.

20750388644457 is a `hidden beast` number, since 2 + 0 + 7 + 50 + 3 + 88 + 64 + 445 + 7 = 666.

It is not a de Polignac number, because 20750388644457 - 2¹⁶ = 20750388578921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20750388644394 and 20750388644403.

It is not an unprimeable number, because it can be changed into a prime (20750388644459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39796008 + ... + 40314054.

It is an arithmetic number, because the mean of its divisors is an integer number (1253454953504).

Almost surely, 2^{20750388644457} is an apocalyptic number.

It is an amenable number.

20750388644457 is a deficient number, since it is larger than the sum of its proper divisors (9332530239639).

20750388644457 is a wasteful number, since it uses less digits than its factorization.

20750388644457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534397 (or 534394 counting only the distinct ones).

The product of its (nonzero) digits is 180633600, while the sum is 63.

The spelling of 20750388644457 in words is "twenty trillion, seven hundred fifty billion, three hundred eighty-eight million, six hundred forty-four thousand, four hundred fifty-seven".