20156571206013 has 32 divisors (see below), whose sum is σ = 31012460282880. Its totient is φ = 11524900717440.

The previous prime is 20156571205957. The next prime is 20156571206021. The reversal of 20156571206013 is 31060217565102.

It is not a de Polignac number, because 20156571206013 - 2²¹ = 20156569108861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20156571206033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181840123 + ... + 181950936.

It is an arithmetic number, because the mean of its divisors is an integer number (969139383840).

Almost surely, 2^{20156571206013} is an apocalyptic number.

20156571206013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20156571206013 is a deficient number, since it is larger than the sum of its proper divisors (10855889076867).

20156571206013 is a wasteful number, since it uses less digits than its factorization.

20156571206013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363791169.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20156571206013 in words is "twenty trillion, one hundred fifty-six billion, five hundred seventy-one million, two hundred six thousand, thirteen".