20910812 has 12 divisors (see below), whose sum is σ = 39408936. Its totient is φ = 9651120.

The previous prime is 20910803. The next prime is 20910823. The reversal of 20910812 is 21801902.

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, 201014 + ... + 201117.

It is an arithmetic number, because the mean of its divisors is an integer number (3284078).

Almost surely, 2^20910812 is an apocalyptic number.

It is an amenable number.

20910812 is a deficient number, since it is larger than the sum of its proper divisors (18498124).

20910812 is a wasteful number, since it uses less digits than its factorization.

20910812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402148 (or 402146 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20910812 is about 4572.8341321329. The cubic root of 20910812 is about 275.5012873196.

The spelling of 20910812 in words is "twenty million, nine hundred ten thousand, eight hundred twelve".