20921336 has 16 divisors (see below), whose sum is σ = 39283440. Its totient is φ = 10445760.

The previous prime is 20921321. The next prime is 20921347. The reversal of 20921336 is 63312902.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6101 + ... + 8891.

It is an arithmetic number, because the mean of its divisors is an integer number (2455215).

Almost surely, 2^20921336 is an apocalyptic number.

It is an amenable number.

20921336 is a deficient number, since it is larger than the sum of its proper divisors (18362104).

20921336 is a wasteful number, since it uses less digits than its factorization.

20921336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734 (or 3730 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20921336 is about 4573.9846960828. The cubic root of 20921336 is about 275.5474976928.

The spelling of 20921336 in words is "twenty million, nine hundred twenty-one thousand, three hundred thirty-six".