21674580 has 96 divisors (see below), whose sum is σ = 64339968. Its totient is φ = 5443200.

The previous prime is 21674561. The next prime is 21674591. The reversal of 21674580 is 8547612.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79845 + ... + 80115.

It is an arithmetic number, because the mean of its divisors is an integer number (670208).

Almost surely, 2^21674580 is an apocalyptic number.

21674580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21674580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32169984).

21674580 is an abundant number, since it is smaller than the sum of its proper divisors (42665388).

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

21674580 is a wasteful number, since it uses less digits than its factorization.

21674580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21674580 is about 4655.5966320118. The cubic root of 21674580 is about 278.8154893149.

The spelling of 21674580 in words is "twenty-one million, six hundred seventy-four thousand, five hundred eighty".