20142169 has 2 divisors, whose sum is σ = 20142170. Its totient is φ = 20142168.

The previous prime is 20142163. The next prime is 20142197. The reversal of 20142169 is 96124102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 25 = 4488^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 20142169 - 2⁹ = 20141657 is a prime.

It is a super-2 number, since 2×20142169² = 811413944049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20142163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071084 + 10071085.

It is an arithmetic number, because the mean of its divisors is an integer number (10071085).

Almost surely, 2^20142169 is an apocalyptic number.

It is an amenable number.

20142169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142169 is an equidigital number, since it uses as much as digits as its factorization.

20142169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20142169 is about 4488.0027852041. The cubic root of 20142169 is about 272.0834203833.

Subtracting from 20142169 its sum of digits (25), we obtain a square (20142144 = 4488²).

The spelling of 20142169 in words is "twenty million, one hundred forty-two thousand, one hundred sixty-nine".