22051988 has 24 divisors (see below), whose sum is σ = 44830464. Its totient is φ = 9295200.

The previous prime is 22051979. The next prime is 22051993. The reversal of 22051988 is 88915022.

It is a super-5 number, since 5×22051988⁵ (a number of 38 digits) contains 55555 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4748 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (1867936).

Almost surely, 2^22051988 is an apocalyptic number.

22051988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22051988 is an abundant number, since it is smaller than the sum of its proper divisors (22778476).

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

22051988 is a wasteful number, since it uses less digits than its factorization.

22051988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12983 (or 12981 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 22051988 is about 4695.9544290804. The cubic root of 22051988 is about 280.4244752252.

The spelling of 22051988 in words is "twenty-two million, fifty-one thousand, nine hundred eighty-eight".