20977444072913 has 4 divisors (see below), whose sum is σ = 20977689764208. Its totient is φ = 20977198381620.

The previous prime is 20977444072891. The next prime is 20977444072939. The reversal of 20977444072913 is 31927044477902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20977444072913 - 2¹² = 20977444068817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20977444072993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122717531 + ... + 122888352.

It is an arithmetic number, because the mean of its divisors is an integer number (5244422441052).

Almost surely, 2^{20977444072913} is an apocalyptic number.

It is an amenable number.

20977444072913 is a deficient number, since it is larger than the sum of its proper divisors (245691295).

20977444072913 is an equidigital number, since it uses as much as digits as its factorization.

20977444072913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245691294.

The product of its (nonzero) digits is 21337344, while the sum is 59.

The spelling of 20977444072913 in words is "twenty trillion, nine hundred seventy-seven billion, four hundred forty-four million, seventy-two thousand, nine hundred thirteen".