21820094 has 16 divisors (see below), whose sum is σ = 35566080. Its totient is φ = 10001880.

The previous prime is 21820087. The next prime is 21820103. The reversal of 21820094 is 49002812.

It is a super-2 number, since 2×21820094² = 952233004337672, which contains 22 as substring.

It is a Curzon number.

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, 8084 + ... + 10439.

It is an arithmetic number, because the mean of its divisors is an integer number (2222880).

Almost surely, 2^21820094 is an apocalyptic number.

21820094 is a deficient number, since it is larger than the sum of its proper divisors (13745986).

21820094 is a wasteful number, since it uses less digits than its factorization.

21820094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18575.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21820094 is about 4671.1983473195. The cubic root of 21820094 is about 279.4380481034.

The spelling of 21820094 in words is "twenty-one million, eight hundred twenty thousand, ninety-four".