20397976 has 16 divisors (see below), whose sum is σ = 38460240. Its totient is φ = 10141920.

The previous prime is 20397967. The next prime is 20398009. The reversal of 20397976 is 67979302.

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, 5596 + ... + 8491.

It is an arithmetic number, because the mean of its divisors is an integer number (2403765).

Almost surely, 2^20397976 is an apocalyptic number.

It is an amenable number.

20397976 is a deficient number, since it is larger than the sum of its proper divisors (18062264).

20397976 is a wasteful number, since it uses less digits than its factorization.

20397976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14274 (or 14270 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 20397976 is about 4516.4118501306. The cubic root of 20397976 is about 273.2304047643.

The spelling of 20397976 in words is "twenty million, three hundred ninety-seven thousand, nine hundred seventy-six".