20995910 has 16 divisors (see below), whose sum is σ = 40700016. Its totient is φ = 7752288.

The previous prime is 20995903. The next prime is 20995939. The reversal of 20995910 is 1959902.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 80624 + ... + 80883.

It is an arithmetic number, because the mean of its divisors is an integer number (2543751).

Almost surely, 2^20995910 is an apocalyptic number.

20995910 is a deficient number, since it is larger than the sum of its proper divisors (19704106).

20995910 is a wasteful number, since it uses less digits than its factorization.

20995910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161527.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 20995910 is about 4582.1294176398. The cubic root of 20995910 is about 275.8745053643.

The spelling of 20995910 in words is "twenty million, nine hundred ninety-five thousand, nine hundred ten".