20169138 has 16 divisors (see below), whose sum is σ = 44005536. Its totient is φ = 6111840.

The previous prime is 20169133. The next prime is 20169139. The reversal of 20169138 is 83196102.

It is not an unprimeable number, because it can be changed into a prime (20169133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152731 + ... + 152862.

It is an arithmetic number, because the mean of its divisors is an integer number (2750346).

Almost surely, 2^20169138 is an apocalyptic number.

20169138 is an abundant number, since it is smaller than the sum of its proper divisors (23836398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20169138 is a wasteful number, since it uses less digits than its factorization.

20169138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305609.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20169138 is about 4491.0063460209. The cubic root of 20169138 is about 272.2047999833.

The spelling of 20169138 in words is "twenty million, one hundred sixty-nine thousand, one hundred thirty-eight".