20877251580 has 96 divisors (see below), whose sum is σ = 65003930880. Its totient is φ = 5562768960.

The previous prime is 20877251579. The next prime is 20877251609. The reversal of 20877251580 is 8515277802.

It is a super-2 number, since 2×20877251580² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 682167 + ... + 712113.

It is an arithmetic number, because the mean of its divisors is an integer number (677124280).

Almost surely, 2^20877251580 is an apocalyptic number.

20877251580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20877251580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32501965440).

20877251580 is an abundant number, since it is smaller than the sum of its proper divisors (44126679300).

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

20877251580 is a wasteful number, since it uses less digits than its factorization.

20877251580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31256 (or 31248 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The spelling of 20877251580 in words is "twenty billion, eight hundred seventy-seven million, two hundred fifty-one thousand, five hundred eighty".