20672208 has 60 divisors (see below), whose sum is σ = 58539780. Its totient is φ = 6809088.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672208 is 80227602.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 12446784 = 2868^2 + 3528^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12010 + ... + 13622.

It is an arithmetic number, because the mean of its divisors is an integer number (975663).

Almost surely, 2^20672208 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 20672208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29269890).

20672208 is an abundant number, since it is smaller than the sum of its proper divisors (37867572).

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

20672208 is a wasteful number, since it uses less digits than its factorization.

20672208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 1707 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20672208 is about 4546.6699902236. The cubic root of 20672208 is about 274.4494019234.

The spelling of 20672208 in words is "twenty million, six hundred seventy-two thousand, two hundred eight".