20523980 has 12 divisors (see below), whose sum is σ = 43100400. Its totient is φ = 8209584.

The previous prime is 20523973. The next prime is 20523983. The reversal of 20523980 is 8932502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523983) 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 3 ways as a sum of consecutive naturals, for example, 513080 + ... + 513119.

It is an arithmetic number, because the mean of its divisors is an integer number (3591700).

Almost surely, 2^20523980 is an apocalyptic number.

20523980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20523980 is an abundant number, since it is smaller than the sum of its proper divisors (22576420).

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

20523980 is a wasteful number, since it uses less digits than its factorization.

20523980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026208 (or 1026206 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20523980 is about 4530.3399430948. The cubic root of 20523980 is about 273.7918571276.

The spelling of 20523980 in words is "twenty million, five hundred twenty-three thousand, nine hundred eighty".