20989057131 has 24 divisors (see below), whose sum is σ = 34783448544. Its totient is φ = 11947069440.

The previous prime is 20989057127. The next prime is 20989057153. The reversal of 20989057131 is 13175098902.

It is not a de Polignac number, because 20989057131 - 2² = 20989057127 is a prime.

It is a super-2 number, since 2×20989057131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20989057121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 631980 + ... + 664361.

It is an arithmetic number, because the mean of its divisors is an integer number (1449310356).

Almost surely, 2^20989057131 is an apocalyptic number.

20989057131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20989057131 is a deficient number, since it is larger than the sum of its proper divisors (13794391413).

20989057131 is a wasteful number, since it uses less digits than its factorization.

20989057131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296611 (or 1296608 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 20989057131 in words is "twenty billion, nine hundred eighty-nine million, fifty-seven thousand, one hundred thirty-one".