16220988 has 72 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 4551840.

The previous prime is 16220977. The next prime is 16221017. The reversal of 16220988 is 88902261.

It is a super-2 number, since 2×16220988² = 526240903392288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14323 + ... + 15413.

It is an arithmetic number, because the mean of its divisors is an integer number (662480).

Almost surely, 2^16220988 is an apocalyptic number.

16220988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16220988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23849280).

16220988 is an abundant number, since it is smaller than the sum of its proper divisors (31477572).

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

16220988 is a wasteful number, since it uses less digits than its factorization.

16220988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16220988 is about 4027.5287708470. The cubic root of 16220988 is about 253.1390238229.

The spelling of 16220988 in words is "sixteen million, two hundred twenty thousand, nine hundred eighty-eight".