16620012 has 24 divisors (see below), whose sum is σ = 43089200. Its totient is φ = 5539968.

The previous prime is 16620001. The next prime is 16620013. The reversal of 16620012 is 21002661.

It is a happy number.

16620012 is a `hidden beast` number, since 1 + 662 + 0 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (16620013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76837 + ... + 77052.

Almost surely, 2^16620012 is an apocalyptic number.

16620012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16620012 is an abundant number, since it is smaller than the sum of its proper divisors (26469188).

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

16620012 is a wasteful number, since it uses less digits than its factorization.

16620012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153902 (or 153894 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16620012 is about 4076.7648938834. The cubic root of 16620012 is about 255.1979086447.

Adding to 16620012 its reverse (21002661), we get a palindrome (37622673).

The spelling of 16620012 in words is "sixteen million, six hundred twenty thousand, twelve".