20557372 has 12 divisors (see below), whose sum is σ = 39245976. Its totient is φ = 9344240.

The previous prime is 20557351. The next prime is 20557387. The reversal of 20557372 is 27375502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233563 + ... + 233650.

It is an arithmetic number, because the mean of its divisors is an integer number (3270498).

Almost surely, 2^20557372 is an apocalyptic number.

20557372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20557372 is a deficient number, since it is larger than the sum of its proper divisors (18688604).

20557372 is a wasteful number, since it uses less digits than its factorization.

20557372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467228 (or 467226 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 20557372 is about 4534.0238199639. The cubic root of 20557372 is about 273.9402608321.

The spelling of 20557372 in words is "twenty million, five hundred fifty-seven thousand, three hundred seventy-two".