20623900 has 36 divisors (see below), whose sum is σ = 48825000. Its totient is φ = 7499200.

The previous prime is 20623891. The next prime is 20623903. The reversal of 20623900 is 932602.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623903) 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, 8275 + ... + 10474.

It is an arithmetic number, because the mean of its divisors is an integer number (1356250).

Almost surely, 2^20623900 is an apocalyptic number.

20623900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20623900 is an abundant number, since it is smaller than the sum of its proper divisors (28201100).

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

20623900 is a wasteful number, since it uses less digits than its factorization.

20623900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18774 (or 18767 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20623900 is about 4541.3544235173. The cubic root of 20623900 is about 274.2354521514.

The spelling of 20623900 in words is "twenty million, six hundred twenty-three thousand, nine hundred".