20715549057 has 24 divisors (see below), whose sum is σ = 34225885824. Its totient is φ = 11827491264.

The previous prime is 20715549047. The next prime is 20715549073. The reversal of 20715549057 is 75094551702.

20715549057 is a `hidden beast` number, since 2 + 0 + 7 + 1 + 554 + 90 + 5 + 7 = 666.

It is not a de Polignac number, because 20715549057 - 2⁷ = 20715548929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20715549037) 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, 62653 + ... + 212970.

It is an arithmetic number, because the mean of its divisors is an integer number (1426078576).

Almost surely, 2^20715549057 is an apocalyptic number.

It is an amenable number.

20715549057 is a deficient number, since it is larger than the sum of its proper divisors (13510336767).

20715549057 is a wasteful number, since it uses less digits than its factorization.

20715549057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276829 (or 276826 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 20715549057 in words is "twenty billion, seven hundred fifteen million, five hundred forty-nine thousand, fifty-seven".