20977133237 has 2 divisors, whose sum is σ = 20977133238. Its totient is φ = 20977133236.

The previous prime is 20977133231. The next prime is 20977133263. The reversal of 20977133237 is 73233177902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20556103876 + 421029361 = 143374^2 + 20519^2 .

It is a cyclic number.

It is not a de Polignac number, because 20977133237 - 2⁶ = 20977133173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20977133231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488566618 + 10488566619.

It is an arithmetic number, because the mean of its divisors is an integer number (10488566619).

Almost surely, 2^20977133237 is an apocalyptic number.

It is an amenable number.

20977133237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20977133237 is an equidigital number, since it uses as much as digits as its factorization.

20977133237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 333396, while the sum is 44.

The spelling of 20977133237 in words is "twenty billion, nine hundred seventy-seven million, one hundred thirty-three thousand, two hundred thirty-seven".