20089980 has 36 divisors (see below), whose sum is σ = 60940152. Its totient is φ = 5357280.

The previous prime is 20089969. The next prime is 20089981. The reversal of 20089980 is 8998002.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20089981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55626 + ... + 55985.

It is an arithmetic number, because the mean of its divisors is an integer number (1692782).

Almost surely, 2^20089980 is an apocalyptic number.

20089980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20089980 is an abundant number, since it is smaller than the sum of its proper divisors (40850172).

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

20089980 is a wasteful number, since it uses less digits than its factorization.

20089980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111626 (or 111621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 20089980 is about 4482.1847351487. The cubic root of 20089980 is about 271.8482248701.

The spelling of 20089980 in words is "twenty million, eighty-nine thousand, nine hundred eighty".