20323905 has 32 divisors (see below), whose sum is σ = 38078208. Its totient is φ = 9062400.

The previous prime is 20323871. The next prime is 20323909. The reversal of 20323905 is 50932302.

It is not a de Polignac number, because 20323905 - 2¹² = 20319809 is a prime.

It is a super-2 number, since 2×20323905² = 826122228898050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20323909) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1945 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (1189944).

Almost surely, 2^20323905 is an apocalyptic number.

It is an amenable number.

20323905 is a deficient number, since it is larger than the sum of its proper divisors (17754303).

20323905 is a wasteful number, since it uses less digits than its factorization.

20323905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 20323905 is about 4508.2041879223. The cubic root of 20323905 is about 272.8992772040.

The spelling of 20323905 in words is "twenty million, three hundred twenty-three thousand, nine hundred five".