21892040 has 16 divisors (see below), whose sum is σ = 49257180. Its totient is φ = 8756800.

The previous prime is 21892037. The next prime is 21892097. The reversal of 21892040 is 4029812.

It can be written as a sum of positive squares in 2 ways, for example, as 21659716 + 232324 = 4654^2 + 482^2 .

It is a super-2 number, since 2×21892040² = 958522830723200, which contains 22 as substring.

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, 273611 + ... + 273690.

Almost surely, 2^21892040 is an apocalyptic number.

21892040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21892040 is an abundant number, since it is smaller than the sum of its proper divisors (27365140).

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

21892040 is a wasteful number, since it uses less digits than its factorization.

21892040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547312 (or 547308 counting only the distinct ones).

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

The square root of 21892040 is about 4678.8930314766. The cubic root of 21892040 is about 279.7448355661.

The spelling of 21892040 in words is "twenty-one million, eight hundred ninety-two thousand, forty".