21654460 has 12 divisors (see below), whose sum is σ = 45474408. Its totient is φ = 8661776.

The previous prime is 21654439. The next prime is 21654473. The reversal of 21654460 is 6445612.

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, 541342 + ... + 541381.

It is an arithmetic number, because the mean of its divisors is an integer number (3789534).

Almost surely, 2^21654460 is an apocalyptic number.

21654460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21654460 is an abundant number, since it is smaller than the sum of its proper divisors (23819948).

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

21654460 is a wasteful number, since it uses less digits than its factorization.

21654460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082732 (or 1082730 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 21654460 is about 4653.4352901915. The cubic root of 21654460 is about 278.7291899980.

It can be divided in two parts, 21 and 654460, that added together give a square (654481 = 809²).

The spelling of 21654460 in words is "twenty-one million, six hundred fifty-four thousand, four hundred sixty".