20989488 has 40 divisors (see below), whose sum is σ = 58395568. Its totient is φ = 6458112.

The previous prime is 20989483. The next prime is 20989513. The reversal of 20989488 is 88498902.

It is a super-5 number, since 5×20989488⁵ (a number of 38 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16195 + ... + 17442.

Almost surely, 2^20989488 is an apocalyptic number.

It is an amenable number.

20989488 is an abundant number, since it is smaller than the sum of its proper divisors (37406080).

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

20989488 is a wasteful number, since it uses less digits than its factorization.

20989488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33661 (or 33655 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 20989488 is about 4581.4285981558. The cubic root of 20989488 is about 275.8463753342.

The spelling of 20989488 in words is "twenty million, nine hundred eighty-nine thousand, four hundred eighty-eight".