20309910 has 32 divisors (see below), whose sum is σ = 48909312. Its totient is φ = 5397600.

The previous prime is 20309903. The next prime is 20309921. The reversal of 20309910 is 1990302.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9435 + ... + 11385.

It is an arithmetic number, because the mean of its divisors is an integer number (1528416).

Almost surely, 2^20309910 is an apocalyptic number.

20309910 is an abundant number, since it is smaller than the sum of its proper divisors (28599402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20309910 is a wasteful number, since it uses less digits than its factorization.

20309910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 20309910 is about 4506.6517504684. The cubic root of 20309910 is about 272.8366235234.

The spelling of 20309910 in words is "twenty million, three hundred nine thousand, nine hundred ten".