20672708 has 36 divisors (see below), whose sum is σ = 43546860. Its totient is φ = 8551872.

The previous prime is 20672683. The next prime is 20672747. The reversal of 20672708 is 80727602.

It can be written as a sum of positive squares in 2 ways, for example, as 4528384 + 16144324 = 2128^2 + 4018^2 .

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, 3866 + ... + 7502.

It is an arithmetic number, because the mean of its divisors is an integer number (1209635).

Almost surely, 2^20672708 is an apocalyptic number.

20672708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20672708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21773430).

20672708 is an abundant number, since it is smaller than the sum of its proper divisors (22874152).

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

20672708 is a wasteful number, since it uses less digits than its factorization.

20672708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684 (or 3675 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20672708 is about 4546.7249751882. The cubic root of 20672708 is about 274.4516146139.

The spelling of 20672708 in words is "twenty million, six hundred seventy-two thousand, seven hundred eight".