20472500 has 60 divisors (see below), whose sum is σ = 47234880. Its totient is φ = 7740000.

The previous prime is 20472497. The next prime is 20472511. The reversal of 20472500 is 527402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 47285 + ... + 47715.

It is an arithmetic number, because the mean of its divisors is an integer number (787248).

Almost surely, 2^20472500 is an apocalyptic number.

20472500 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 20472500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23617440).

20472500 is an abundant number, since it is smaller than the sum of its proper divisors (26762380).

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

20472500 is a wasteful number, since it uses less digits than its factorization.

20472500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20472500 is about 4524.6546829565. The cubic root of 20472500 is about 273.5627494228.

Adding to 20472500 its reverse (527402), we get a palindrome (20999902).

The spelling of 20472500 in words is "twenty million, four hundred seventy-two thousand, five hundred".