20891484 has 36 divisors (see below), whose sum is σ = 54632760. Its totient is φ = 6723360.

The previous prime is 20891473. The next prime is 20891503. The reversal of 20891484 is 48419802.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8962 + ... + 11049.

Almost surely, 2^20891484 is an apocalyptic number.

It is an amenable number.

20891484 is an abundant number, since it is smaller than the sum of its proper divisors (33741276).

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

20891484 is a wasteful number, since it uses less digits than its factorization.

20891484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20050 (or 20045 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20891484 is about 4570.7202933455. The cubic root of 20891484 is about 275.4163786077.

The spelling of 20891484 in words is "twenty million, eight hundred ninety-one thousand, four hundred eighty-four".