20472288 has 24 divisors (see below), whose sum is σ = 53740008. Its totient is φ = 6824064.

The previous prime is 20472281. The next prime is 20472293. The reversal of 20472288 is 88227402.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20472288² = 838229151909888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106531 + ... + 106722.

It is an arithmetic number, because the mean of its divisors is an integer number (2239167).

Almost surely, 2^20472288 is an apocalyptic number.

It is an amenable number.

20472288 is an abundant number, since it is smaller than the sum of its proper divisors (33267720).

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

20472288 is a wasteful number, since it uses less digits than its factorization.

20472288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213266 (or 213258 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20472288 is about 4524.6312556937. The cubic root of 20472288 is about 273.5618051398.

The spelling of 20472288 in words is "twenty million, four hundred seventy-two thousand, two hundred eighty-eight".