20277391881 has 16 divisors (see below), whose sum is σ = 27457486848. Its totient is φ = 13309405200.

The previous prime is 20277391877. The next prime is 20277391961. The reversal of 20277391881 is 18819377202.

It is a happy number.

It is not a de Polignac number, because 20277391881 - 2² = 20277391877 is a prime.

It is a super-2 number, since 2×20277391881² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20277391881.

It is not an unprimeable number, because it can be changed into a prime (20277391811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153225 + ... + 253046.

It is an arithmetic number, because the mean of its divisors is an integer number (1716092928).

Almost surely, 2^20277391881 is an apocalyptic number.

It is an amenable number.

20277391881 is a deficient number, since it is larger than the sum of its proper divisors (7180094967).

20277391881 is a wasteful number, since it uses less digits than its factorization.

20277391881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406532.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 20277391881 in words is "twenty billion, two hundred seventy-seven million, three hundred ninety-one thousand, eight hundred eighty-one".