21803480 has 16 divisors (see below), whose sum is σ = 49057920. Its totient is φ = 8721376.

The previous prime is 21803479. The next prime is 21803521. The reversal of 21803480 is 8430812.

It is a super-2 number, since 2×21803480² = 950783480220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272504 + ... + 272583.

It is an arithmetic number, because the mean of its divisors is an integer number (3066120).

Almost surely, 2^21803480 is an apocalyptic number.

21803480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21803480 is an abundant number, since it is smaller than the sum of its proper divisors (27254440).

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

21803480 is a wasteful number, since it uses less digits than its factorization.

21803480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545098 (or 545094 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21803480 is about 4669.4196641553. The cubic root of 21803480 is about 279.3671079487.

The spelling of 21803480 in words is "twenty-one million, eight hundred three thousand, four hundred eighty".