20472720 has 40 divisors (see below), whose sum is σ = 63466176. Its totient is φ = 5459328.

The previous prime is 20472719. The next prime is 20472733. The reversal of 20472720 is 2727402.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42412 + ... + 42891.

Almost surely, 2^20472720 is an apocalyptic number.

20472720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20472720 is an abundant number, since it is smaller than the sum of its proper divisors (42993456).

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

20472720 is a wasteful number, since it uses less digits than its factorization.

20472720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85319 (or 85313 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 20472720 is about 4524.6789941387. The cubic root of 20472720 is about 273.5637293323.

The spelling of 20472720 in words is "twenty million, four hundred seventy-two thousand, seven hundred twenty".