20671708 has 12 divisors (see below), whose sum is σ = 37058112. Its totient is φ = 10083680.

The previous prime is 20671661. The next prime is 20671723. The reversal of 20671708 is 80717602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20671708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62860 + ... + 63187.

It is an arithmetic number, because the mean of its divisors is an integer number (3088176).

Almost surely, 2^20671708 is an apocalyptic number.

It is an amenable number.

20671708 is a deficient number, since it is larger than the sum of its proper divisors (16386404).

20671708 is a wasteful number, since it uses less digits than its factorization.

20671708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126092 (or 126090 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20671708 is about 4546.6150045941. The cubic root of 20671708 is about 274.4471891972.

The spelling of 20671708 in words is "twenty million, six hundred seventy-one thousand, seven hundred eight".