20472690 has 96 divisors (see below), whose sum is σ = 60246720. Its totient is φ = 4427136.

The previous prime is 20472659. The next prime is 20472703. The reversal of 20472690 is 9627402.

It is a happy number.

It is a super-2 number, since 2×20472690² = 838262071672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27564 + ... + 28296.

It is an arithmetic number, because the mean of its divisors is an integer number (627570).

Almost surely, 2^20472690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20472690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30123360).

20472690 is an abundant number, since it is smaller than the sum of its proper divisors (39774030).

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

20472690 is a wasteful number, since it uses less digits than its factorization.

20472690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20472690 is about 4524.6756789852. The cubic root of 20472690 is about 273.5635957087.

The spelling of 20472690 in words is "twenty million, four hundred seventy-two thousand, six hundred ninety".