20572997 has 4 divisors (see below), whose sum is σ = 20765376. Its totient is φ = 20380620.

The previous prime is 20572931. The next prime is 20573011. The reversal of 20572997 is 79927502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20572997 - 2¹² = 20568901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572597) 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, 96029 + ... + 96242.

It is an arithmetic number, because the mean of its divisors is an integer number (5191344).

Almost surely, 2^20572997 is an apocalyptic number.

It is an amenable number.

20572997 is a deficient number, since it is larger than the sum of its proper divisors (192379).

20572997 is a wasteful number, since it uses less digits than its factorization.

20572997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192378.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 20572997 is about 4535.7465758131. The cubic root of 20572997 is about 274.0096476614.

The spelling of 20572997 in words is "twenty million, five hundred seventy-two thousand, nine hundred ninety-seven".