16620500 has 48 divisors (see below), whose sum is σ = 39106704. Its totient is φ = 6134400.

The previous prime is 16620493. The next prime is 16620521. The reversal of 16620500 is 502661.

It can be written as a sum of positive squares in 8 ways, for example, as 9156676 + 7463824 = 3026^2 + 2732^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5222 + ... + 7778.

It is an arithmetic number, because the mean of its divisors is an integer number (814723).

Almost surely, 2^16620500 is an apocalyptic number.

16620500 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 16620500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19553352).

16620500 is an abundant number, since it is smaller than the sum of its proper divisors (22486204).

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

16620500 is a wasteful number, since it uses less digits than its factorization.

16620500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589 (or 2577 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 16620500 is about 4076.8247448229. The cubic root of 16620500 is about 255.2004063436.

The spelling of 16620500 in words is "sixteen million, six hundred twenty thousand, five hundred".