20183920 has 40 divisors (see below), whose sum is σ = 47255904. Its totient is φ = 8017152.

The previous prime is 20183873. The next prime is 20183929. The reversal of 20183920 is 2938102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20183929) 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, 11757 + ... + 13363.

Almost surely, 2^20183920 is an apocalyptic number.

20183920 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 20183920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23627952).

20183920 is an abundant number, since it is smaller than the sum of its proper divisors (27071984).

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

20183920 is a wasteful number, since it uses less digits than its factorization.

20183920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20183920 is about 4492.6517781818. The cubic root of 20183920 is about 272.2712835510.

The spelling of 20183920 in words is "twenty million, one hundred eighty-three thousand, nine hundred twenty".