20910394 has 12 divisors (see below), whose sum is σ = 32053914. Its totient is φ = 10230584.

The previous prime is 20910377. The next prime is 20910401. The reversal of 20910394 is 49301902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 974169 = 4465^2 + 987^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2052 + ... + 6784.

Almost surely, 2^20910394 is an apocalyptic number.

20910394 is a deficient number, since it is larger than the sum of its proper divisors (11143520).

20910394 is an equidigital number, since it uses as much as digits as its factorization.

20910394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4829 (or 4782 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20910394 is about 4572.7884272072. The cubic root of 20910394 is about 275.4994515817.

The spelling of 20910394 in words is "twenty million, nine hundred ten thousand, three hundred ninety-four".