20157872706438 has 64 divisors (see below), whose sum is σ = 42416312712192. Its totient is φ = 6374164579200.

The previous prime is 20157872706151. The next prime is 20157872706457. The reversal of 20157872706438 is 83460727875102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11984656 + ... + 13562732.

It is an arithmetic number, because the mean of its divisors is an integer number (662754886128).

Almost surely, 2^{20157872706438} is an apocalyptic number.

20157872706438 is an abundant number, since it is smaller than the sum of its proper divisors (22258440005754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20157872706438 is a wasteful number, since it uses less digits than its factorization.

20157872706438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578869.

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 20157872706438 in words is "twenty trillion, one hundred fifty-seven billion, eight hundred seventy-two million, seven hundred six thousand, four hundred thirty-eight".