20620980 has 72 divisors (see below), whose sum is σ = 64882272. Its totient is φ = 5497632.

The previous prime is 20620973. The next prime is 20620981. The reversal of 20620980 is 8902602.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620981) 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 23 ways as a sum of consecutive naturals, for example, 2739 + ... + 6981.

Almost surely, 2^20620980 is an apocalyptic number.

20620980 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 20620980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32441136).

20620980 is an abundant number, since it is smaller than the sum of its proper divisors (44261292).

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

20620980 is a wasteful number, since it uses less digits than its factorization.

20620980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20620980 is about 4541.0329221445. The cubic root of 20620980 is about 274.2225091529. Note that the first 3 decimals are identical.

The spelling of 20620980 in words is "twenty million, six hundred twenty thousand, nine hundred eighty".