20509922 has 16 divisors (see below), whose sum is σ = 33371352. Its totient is φ = 9415680.

The previous prime is 20509921. The next prime is 20509933. The reversal of 20509922 is 22990502.

It can be written as a sum of positive squares in 4 ways, for example, as 17380561 + 3129361 = 4169^2 + 1769^2 .

It is not an unprimeable number, because it can be changed into a prime (20509921) 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, 5963 + ... + 8750.

Almost surely, 2^20509922 is an apocalyptic number.

20509922 is a deficient number, since it is larger than the sum of its proper divisors (12861430).

20509922 is a wasteful number, since it uses less digits than its factorization.

20509922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14773.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 20509922 is about 4528.7881381226. The cubic root of 20509922 is about 273.7293311612.

It can be divided in two parts, 2050 and 9922, that multiplied together give a square (20340100 = 4510²).

The spelling of 20509922 in words is "twenty million, five hundred nine thousand, nine hundred twenty-two".