20868910 has 16 divisors (see below), whose sum is σ = 37616400. Its totient is φ = 8335936.

The previous prime is 20868907. The next prime is 20868929. The reversal of 20868910 is 1986802.

It is a super-2 number, since 2×20868910² = 871022809176200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12081 + ... + 13699.

It is an arithmetic number, because the mean of its divisors is an integer number (2351025).

Almost surely, 2^20868910 is an apocalyptic number.

20868910 is a deficient number, since it is larger than the sum of its proper divisors (16747490).

20868910 is a wasteful number, since it uses less digits than its factorization.

20868910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 20868910 is about 4568.2502120615. The cubic root of 20868910 is about 275.3171437552.

The spelling of 20868910 in words is "twenty million, eight hundred sixty-eight thousand, nine hundred ten".