20813484 has 24 divisors (see below), whose sum is σ = 49068208. Its totient is φ = 6865920.

The previous prime is 20813479. The next prime is 20813497. The reversal of 20813484 is 48431802.

It is a super-2 number, since 2×20813484² = 866402232436512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7777 + ... + 10104.

Almost surely, 2^20813484 is an apocalyptic number.

It is an amenable number.

20813484 is an abundant number, since it is smaller than the sum of its proper divisors (28254724).

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

20813484 is a wasteful number, since it uses less digits than its factorization.

20813484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17985 (or 17983 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20813484 is about 4562.1797421847. The cubic root of 20813484 is about 275.0731882335.

It can be divided in two parts, 2081 and 3484, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 20813484 in words is "twenty million, eight hundred thirteen thousand, four hundred eighty-four".