19620980 has 12 divisors (see below), whose sum is σ = 41204100. Its totient is φ = 7848384.

The previous prime is 19620947. The next prime is 19620983. The reversal of 19620980 is 8902691.

It can be written as a sum of positive squares in 2 ways, for example, as 5438224 + 14182756 = 2332^2 + 3766^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19620980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19620983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490505 + ... + 490544.

It is an arithmetic number, because the mean of its divisors is an integer number (3433675).

Almost surely, 2^19620980 is an apocalyptic number.

19620980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19620980 is an abundant number, since it is smaller than the sum of its proper divisors (21583120).

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

19620980 is a wasteful number, since it uses less digits than its factorization.

19620980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981058 (or 981056 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 19620980 is about 4429.5575399807. The cubic root of 19620980 is about 269.7161168050.

The spelling of 19620980 in words is "nineteen million, six hundred twenty thousand, nine hundred eighty".