20939210 has 16 divisors (see below), whose sum is σ = 37742976. Its totient is φ = 8364048.

The previous prime is 20939207. The next prime is 20939213. The reversal of 20939210 is 1293902.

It is an interprime number because it is at equal distance from previous prime (20939207) and next prime (20939213).

It is a self number, because there is not a number n which added to its sum of digits gives 20939210.

It is not an unprimeable number, because it can be changed into a prime (20939213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12227 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (2358936).

Almost surely, 2^20939210 is an apocalyptic number.

20939210 is a deficient number, since it is larger than the sum of its proper divisors (16803766).

20939210 is a wasteful number, since it uses less digits than its factorization.

20939210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20939210 is about 4575.9381551765. The cubic root of 20939210 is about 275.6259460617.

The spelling of 20939210 in words is "twenty million, nine hundred thirty-nine thousand, two hundred ten".