20989152 has 96 divisors (see below), whose sum is σ = 64864800. Its totient is φ = 6580224.

The previous prime is 20989147. The next prime is 20989153. The reversal of 20989152 is 25198902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989153) 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 15 ways as a sum of consecutive naturals, for example, 13974 + ... + 15402.

It is an arithmetic number, because the mean of its divisors is an integer number (675675).

Almost surely, 2^20989152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20989152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32432400).

20989152 is an abundant number, since it is smaller than the sum of its proper divisors (43875648).

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

20989152 is a wasteful number, since it uses less digits than its factorization.

20989152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20989152 is about 4581.3919282244. The cubic root of 20989152 is about 275.8449034089.

The spelling of 20989152 in words is "twenty million, nine hundred eighty-nine thousand, one hundred fifty-two".