21693080 has 32 divisors (see below), whose sum is σ = 49321440. Its totient is φ = 8586240.

The previous prime is 21693053. The next prime is 21693097. The reversal of 21693080 is 8039612.

It is a congruent number.

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, 1085 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (1541295).

Almost surely, 2^21693080 is an apocalyptic number.

21693080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21693080 is an abundant number, since it is smaller than the sum of its proper divisors (27628360).

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

21693080 is a wasteful number, since it uses less digits than its factorization.

21693080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5699 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21693080 is about 4657.5830642083. The cubic root of 21693080 is about 278.8947929618.

The spelling of 21693080 in words is "twenty-one million, six hundred ninety-three thousand, eighty".