20169331 has 12 divisors (see below), whose sum is σ = 25267872. Its totient is φ = 15957648.

The previous prime is 20169323. The next prime is 20169349. The reversal of 20169331 is 13396102.

It is not a de Polignac number, because 20169331 - 2³ = 20169323 is a prime.

It is a super-2 number, since 2×20169331² = 813603825975122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20169296 and 20169305.

It is not an unprimeable number, because it can be changed into a prime (20169301) 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 11 ways as a sum of consecutive naturals, for example, 15195 + ... + 16468.

It is an arithmetic number, because the mean of its divisors is an integer number (2105656).

Almost surely, 2^20169331 is an apocalyptic number.

20169331 is a deficient number, since it is larger than the sum of its proper divisors (5098541).

20169331 is a wasteful number, since it uses less digits than its factorization.

20169331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31690 (or 31683 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20169331 is about 4491.0278333584. The cubic root of 20169331 is about 272.2056682299.

The spelling of 20169331 in words is "twenty million, one hundred sixty-nine thousand, three hundred thirty-one".