20623560 has 32 divisors (see below), whose sum is σ = 61871040. Its totient is φ = 5499584.

The previous prime is 20623513. The next prime is 20623573. The reversal of 20623560 is 6532602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20623560.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 85812 + ... + 86051.

It is an arithmetic number, because the mean of its divisors is an integer number (1933470).

Almost surely, 2^20623560 is an apocalyptic number.

20623560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20623560 is an abundant number, since it is smaller than the sum of its proper divisors (41247480).

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

20623560 is a wasteful number, since it uses less digits than its factorization.

20623560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171877 (or 171873 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20623560 is about 4541.3169895967. The cubic root of 20623560 is about 274.2339451527.

The spelling of 20623560 in words is "twenty million, six hundred twenty-three thousand, five hundred sixty".