21676020 has 96 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 5351424.

The previous prime is 21676007. The next prime is 21676033. The reversal of 21676020 is 2067612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21676007) and next prime (21676033).

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, 80446 + ... + 80714.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^21676020 is an apocalyptic number.

21676020 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 21676020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32659200).

21676020 is an abundant number, since it is smaller than the sum of its proper divisors (43642380).

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

21676020 is a wasteful number, since it uses less digits than its factorization.

21676020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21676020 is about 4655.7512820167. The cubic root of 21676020 is about 278.8216637585.

The spelling of 21676020 in words is "twenty-one million, six hundred seventy-six thousand, twenty".