20323940 has 72 divisors (see below), whose sum is σ = 52879680. Its totient is φ = 6424704.

The previous prime is 20323921. The next prime is 20323943. The reversal of 20323940 is 4932302.

It is not an unprimeable number, because it can be changed into a prime (20323943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23231 + ... + 24089.

It is an arithmetic number, because the mean of its divisors is an integer number (734440).

Almost surely, 2^20323940 is an apocalyptic number.

20323940 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 20323940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26439840).

20323940 is an abundant number, since it is smaller than the sum of its proper divisors (32555740).

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

20323940 is a wasteful number, since it uses less digits than its factorization.

20323940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20323940 is about 4508.2080697324. The cubic root of 20323940 is about 272.8994338581.

The spelling of 20323940 in words is "twenty million, three hundred twenty-three thousand, nine hundred forty".