20897708 has 48 divisors (see below), whose sum is σ = 41743296. Its totient is φ = 9081600.

The previous prime is 20897687. The next prime is 20897729. The reversal of 20897708 is 80779802.

It is an interprime number because it is at equal distance from previous prime (20897687) and next prime (20897729).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120710 + ... + 120882.

It is an arithmetic number, because the mean of its divisors is an integer number (869652).

Almost surely, 2^20897708 is an apocalyptic number.

It is an amenable number.

20897708 is a deficient number, since it is larger than the sum of its proper divisors (20845588).

20897708 is a wasteful number, since it uses less digits than its factorization.

20897708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 20897708 is about 4571.4010981317. The cubic root of 20897708 is about 275.4437266145.

The spelling of 20897708 in words is "twenty million, eight hundred ninety-seven thousand, seven hundred eight".