20543572 has 24 divisors (see below), whose sum is σ = 41477184. Its totient is φ = 8720832.

The previous prime is 20543569. The next prime is 20543573. The reversal of 20543572 is 27534502.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20543572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433 + ... + 6424.

It is an arithmetic number, because the mean of its divisors is an integer number (1728216).

Almost surely, 2^20543572 is an apocalyptic number.

It is an amenable number.

20543572 is an abundant number, since it is smaller than the sum of its proper divisors (20933612).

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

20543572 is a wasteful number, since it uses less digits than its factorization.

20543572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6975 (or 6973 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20543572 is about 4532.5017374514. The cubic root of 20543572 is about 273.8789491393.

It can be divided in two parts, 20543 and 572, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20543572 in words is "twenty million, five hundred forty-three thousand, five hundred seventy-two".