20672168 has 32 divisors (see below), whose sum is σ = 42988320. Its totient is φ = 9240000.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672168 is 86127602.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3443 + ... + 7293.

It is an arithmetic number, because the mean of its divisors is an integer number (1343385).

Almost surely, 2^20672168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20672168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21494160).

20672168 is an abundant number, since it is smaller than the sum of its proper divisors (22316152).

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

20672168 is a wasteful number, since it uses less digits than its factorization.

20672168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929 (or 3925 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20672168 is about 4546.6655913977. The cubic root of 20672168 is about 274.4492249066.

The spelling of 20672168 in words is "twenty million, six hundred seventy-two thousand, one hundred sixty-eight".