20445758757 has 12 divisors (see below), whose sum is σ = 29536106860. Its totient is φ = 13628962368.

The previous prime is 20445758737. The next prime is 20445758761. The reversal of 20445758757 is 75785754402.

20445758757 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 5 + 7 + 587 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8503421796 + 11942336961 = 92214^2 + 109281^2 .

It is not a de Polignac number, because 20445758757 - 2⁷ = 20445758629 is a prime.

It is a super-2 number, since 2×20445758757² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445758737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41632 + ... + 206457.

Almost surely, 2^20445758757 is an apocalyptic number.

It is an amenable number.

20445758757 is a deficient number, since it is larger than the sum of its proper divisors (9090348103).

20445758757 is a wasteful number, since it uses less digits than its factorization.

20445758757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257252 (or 257249 counting only the distinct ones).

The product of its (nonzero) digits is 10976000, while the sum is 54.

It can be divided in two parts, 204 and 45758757, that added together give a triangular number (45758961 = T₉₅₆₆).

The spelling of 20445758757 in words is "twenty billion, four hundred forty-five million, seven hundred fifty-eight thousand, seven hundred fifty-seven".