20137123280 has 40 divisors (see below), whose sum is σ = 46824970272. Its totient is φ = 8053789824.

The previous prime is 20137123249. The next prime is 20137123297. The reversal of 20137123280 is 8232173102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 935519 + ... + 956801.

Almost surely, 2^20137123280 is an apocalyptic number.

20137123280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20137123280 is an abundant number, since it is smaller than the sum of its proper divisors (26687846992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20137123280 is a wasteful number, since it uses less digits than its factorization.

20137123280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33123 (or 33117 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 20137123280 its reverse (8232173102), we get a palindrome (28369296382).

The spelling of 20137123280 in words is "twenty billion, one hundred thirty-seven million, one hundred twenty-three thousand, two hundred eighty".