21894760 has 16 divisors (see below), whose sum is σ = 49263300. Its totient is φ = 8757888.

The previous prime is 21894751. The next prime is 21894839. The reversal of 21894760 is 6749812.

It can be written as a sum of positive squares in 2 ways, for example, as 18818244 + 3076516 = 4338^2 + 1754^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273645 + ... + 273724.

Almost surely, 2^21894760 is an apocalyptic number.

21894760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21894760 is an abundant number, since it is smaller than the sum of its proper divisors (27368540).

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

21894760 is a wasteful number, since it uses less digits than its factorization.

21894760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547380 (or 547376 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21894760 is about 4679.1836894911. The cubic root of 21894760 is about 279.7564208187.

The spelling of 21894760 in words is "twenty-one million, eight hundred ninety-four thousand, seven hundred sixty".