20757871418 has 8 divisors (see below), whose sum is σ = 31144309812. Its totient is φ = 10376434816.

The previous prime is 20757871399. The next prime is 20757871429. The reversal of 20757871418 is 81417875702.

It can be written as a sum of positive squares in 2 ways, for example, as 18675135649 + 2082735769 = 136657^2 + 45637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240055 + ... + 1256682.

Almost surely, 2^20757871418 is an apocalyptic number.

20757871418 is a deficient number, since it is larger than the sum of its proper divisors (10386438394).

20757871418 is a wasteful number, since it uses less digits than its factorization.

20757871418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500896.

The product of its (nonzero) digits is 878080, while the sum is 50.

The spelling of 20757871418 in words is "twenty billion, seven hundred fifty-seven million, eight hundred seventy-one thousand, four hundred eighteen".