20669616 has 60 divisors (see below), whose sum is σ = 63109800. Its totient is φ = 6263040.

The previous prime is 20669611. The next prime is 20669641. The reversal of 20669616 is 61696602.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20669611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4941 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (1051830).

Almost surely, 2^20669616 is an apocalyptic number.

It is an amenable number.

20669616 is an abundant number, since it is smaller than the sum of its proper divisors (42440184).

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

20669616 is a wasteful number, since it uses less digits than its factorization.

20669616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13074 (or 13065 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20669616 is about 4546.3849375080. The cubic root of 20669616 is about 274.4379307639.

The spelling of 20669616 in words is "twenty million, six hundred sixty-nine thousand, six hundred sixteen".