20623500 has 72 divisors (see below), whose sum is σ = 65074464. Its totient is φ = 5498400.

The previous prime is 20623489. The next prime is 20623507. The reversal of 20623500 is 532602.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20623507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2209 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (903812).

Almost surely, 2^20623500 is an apocalyptic number.

20623500 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 20623500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32537232).

20623500 is an abundant number, since it is smaller than the sum of its proper divisors (44450964).

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

20623500 is a wasteful number, since it uses less digits than its factorization.

20623500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608 (or 4593 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20623500 is about 4541.3103835787. The cubic root of 20623500 is about 274.2336792101.

The spelling of 20623500 in words is "twenty million, six hundred twenty-three thousand, five hundred".