20669634 has 64 divisors (see below), whose sum is σ = 48470400. Its totient is φ = 6519744.

The previous prime is 20669611. The next prime is 20669641. The reversal of 20669634 is 43696602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104824 + ... + 105020.

It is an arithmetic number, because the mean of its divisors is an integer number (757350).

Almost surely, 2^20669634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20669634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24235200).

20669634 is an abundant number, since it is smaller than the sum of its proper divisors (27800766).

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

20669634 is a wasteful number, since it uses less digits than its factorization.

20669634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 20669634 is about 4546.3869171024. The cubic root of 20669634 is about 274.4380104281.

The spelling of 20669634 in words is "twenty million, six hundred sixty-nine thousand, six hundred thirty-four".