20989546 has 8 divisors (see below), whose sum is σ = 31790304. Its totient is φ = 10392780.

The previous prime is 20989541. The next prime is 20989567. The reversal of 20989546 is 64598902.

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

It is a super-2 number, since 2×20989546² = 881122082572232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20989541) 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, 50740 + ... + 51151.

It is an arithmetic number, because the mean of its divisors is an integer number (3973788).

Almost surely, 2^20989546 is an apocalyptic number.

20989546 is a deficient number, since it is larger than the sum of its proper divisors (10800758).

20989546 is a wasteful number, since it uses less digits than its factorization.

20989546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101996.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20989546 is about 4581.4349280547. The cubic root of 20989546 is about 275.8466294150.

The spelling of 20989546 in words is "twenty million, nine hundred eighty-nine thousand, five hundred forty-six".