20897936 has 10 divisors (see below), whose sum is σ = 40489782. Its totient is φ = 10448960.

The previous prime is 20897923. The next prime is 20897969. The reversal of 20897936 is 63979802.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 250000 = 4544^2 + 500^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653045 + ... + 653076.

Almost surely, 2^20897936 is an apocalyptic number.

It is an amenable number.

20897936 is a deficient number, since it is larger than the sum of its proper divisors (19591846).

20897936 is a wasteful number, since it uses less digits than its factorization.

20897936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306129 (or 1306123 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20897936 is about 4571.4260357136. The cubic root of 20897936 is about 275.4447283342. Note that the first 3 decimals are identical.

The spelling of 20897936 in words is "twenty million, eight hundred ninety-seven thousand, nine hundred thirty-six".