16622820 has 120 divisors (see below), whose sum is σ = 53991168. Its totient is φ = 4276800.

The previous prime is 16622807. The next prime is 16622831. The reversal of 16622820 is 2822661.

16622820 is a `hidden beast` number, since 16 + 622 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50055 + ... + 50385.

Almost surely, 2^16622820 is an apocalyptic number.

16622820 is a gapful number since it is divisible by the number (10) 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 16622820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26995584).

16622820 is an abundant number, since it is smaller than the sum of its proper divisors (37368348).

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

16622820 is a wasteful number, since it uses less digits than its factorization.

16622820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 16622820 is about 4077.1092700589. The cubic root of 16622820 is about 255.2122799815.

The spelling of 16622820 in words is "sixteen million, six hundred twenty-two thousand, eight hundred twenty".