20122905 has 24 divisors (see below), whose sum is σ = 35392896. Its totient is φ = 9755680.

The previous prime is 20122903. The next prime is 20122979. The reversal of 20122905 is 50922102.

It is not a de Polignac number, because 20122905 - 2¹ = 20122903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20122901) 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 23 ways as a sum of consecutive naturals, for example, 3729 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (1474704).

Almost surely, 2^20122905 is an apocalyptic number.

It is an amenable number.

20122905 is a deficient number, since it is larger than the sum of its proper divisors (15269991).

20122905 is a wasteful number, since it uses less digits than its factorization.

20122905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11117 (or 11106 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20122905 is about 4485.8561055834. The cubic root of 20122905 is about 271.9966523882.

The spelling of 20122905 in words is "twenty million, one hundred twenty-two thousand, nine hundred five".