20842572 has 12 divisors (see below), whose sum is σ = 48632696. Its totient is φ = 6947520.

The previous prime is 20842553. The next prime is 20842579. The reversal of 20842572 is 27524802.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20842579) 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, 868429 + ... + 868452.

Almost surely, 2^20842572 is an apocalyptic number.

It is an amenable number.

20842572 is an abundant number, since it is smaller than the sum of its proper divisors (27790124).

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

20842572 is a wasteful number, since it uses less digits than its factorization.

20842572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736888 (or 1736886 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20842572 is about 4565.3665789288. The cubic root of 20842572 is about 275.2012719373.

It can be divided in two parts, 2084 and 2572, that added together give a triangular number (4656 = T₉₆).

The spelling of 20842572 in words is "twenty million, eight hundred forty-two thousand, five hundred seventy-two".