20862980 has 24 divisors (see below), whose sum is σ = 44112600. Its totient is φ = 8288000.

The previous prime is 20862979. The next prime is 20862983. The reversal of 20862980 is 8926802.

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 20775364 = 296^2 + 4558^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20862980.

It is not an unprimeable number, because it can be changed into a prime (20862983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (1838025).

Almost surely, 2^20862980 is an apocalyptic number.

20862980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20862980 is an abundant number, since it is smaller than the sum of its proper divisors (23249620).

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

20862980 is a wasteful number, since it uses less digits than its factorization.

20862980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159 (or 7157 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20862980 is about 4567.6011209386. The cubic root of 20862980 is about 275.2910637263.

The spelling of 20862980 in words is "twenty million, eight hundred sixty-two thousand, nine hundred eighty".