20501572 has 48 divisors (see below), whose sum is σ = 44568832. Its totient is φ = 8035200.

The previous prime is 20501563. The next prime is 20501573. The reversal of 20501572 is 27510502.

It is not an unprimeable number, because it can be changed into a prime (20501573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54778 + ... + 55150.

Almost surely, 2^20501572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20501572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22284416).

20501572 is an abundant number, since it is smaller than the sum of its proper divisors (24067260).

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

20501572 is a wasteful number, since it uses less digits than its factorization.

20501572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20501572 is about 4527.8661640998. The cubic root of 20501572 is about 273.6921792214.

The spelling of 20501572 in words is "twenty million, five hundred one thousand, five hundred seventy-two".