16620690 has 32 divisors (see below), whose sum is σ = 40489920. Its totient is φ = 4365504.

The previous prime is 16620689. The next prime is 16620691. The reversal of 16620690 is 9602661.

It is an interprime number because it is at equal distance from previous prime (16620689) and next prime (16620691).

It is a super-2 number, since 2×16620690² = 552494672152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (16620691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2125 + ... + 6144.

It is an arithmetic number, because the mean of its divisors is an integer number (1265310).

Almost surely, 2^16620690 is an apocalyptic number.

16620690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16620690 is an abundant number, since it is smaller than the sum of its proper divisors (23869230).

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

16620690 is a wasteful number, since it uses less digits than its factorization.

16620690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 16620690 is about 4076.8480472051. The cubic root of 16620690 is about 255.2013787952.

The spelling of 16620690 in words is "sixteen million, six hundred twenty thousand, six hundred ninety".