20870156658 has 64 divisors (see below), whose sum is σ = 47910949632. Its totient is φ = 6003763200.

The previous prime is 20870156647. The next prime is 20870156669. The reversal of 20870156658 is 85665107802.

It is an interprime number because it is at equal distance from previous prime (20870156647) and next prime (20870156669).

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, 148110 + ... + 252342.

It is an arithmetic number, because the mean of its divisors is an integer number (748608588).

Almost surely, 2^20870156658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20870156658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23955474816).

20870156658 is an abundant number, since it is smaller than the sum of its proper divisors (27040792974).

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

20870156658 is a wasteful number, since it uses less digits than its factorization.

20870156658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104419.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 20870156658 in words is "twenty billion, eight hundred seventy million, one hundred fifty-six thousand, six hundred fifty-eight".