20572989 has 8 divisors (see below), whose sum is σ = 27469920. Its totient is φ = 13695696.

The previous prime is 20572931. The next prime is 20573011. The reversal of 20572989 is 98927502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20572989 - 2⁸ = 20572733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20572989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572789) 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, 2259 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (3433740).

Almost surely, 2^20572989 is an apocalyptic number.

It is an amenable number.

20572989 is a deficient number, since it is larger than the sum of its proper divisors (6896931).

20572989 is an equidigital number, since it uses as much as digits as its factorization.

20572989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9819.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 20572989 is about 4535.7456939295. The cubic root of 20572989 is about 274.0096121444.

The spelling of 20572989 in words is "twenty million, five hundred seventy-two thousand, nine hundred eighty-nine".