20621484 has 72 divisors (see below), whose sum is σ = 56718480. Its totient is φ = 6279552.

The previous prime is 20621443. The next prime is 20621519. The reversal of 20621484 is 48412602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64894 + ... + 65210.

Almost surely, 2^20621484 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 20621484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28359240).

20621484 is an abundant number, since it is smaller than the sum of its proper divisors (36096996).

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

20621484 is a wasteful number, since it uses less digits than its factorization.

20621484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20621484 is about 4541.0884157876. The cubic root of 20621484 is about 274.2247432372.

The spelling of 20621484 in words is "twenty million, six hundred twenty-one thousand, four hundred eighty-four".