20312069 has 4 divisors (see below), whose sum is σ = 20332140. Its totient is φ = 20292000.

The previous prime is 20312063. The next prime is 20312077. The reversal of 20312069 is 96021302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6061444 + 14250625 = 2462^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312069 - 2⁴ = 20312053 is a prime.

It is a super-2 number, since 2×20312069² = 825160294121522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312063) 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 3 ways as a sum of consecutive naturals, for example, 8432 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (5083035).

Almost surely, 2^20312069 is an apocalyptic number.

It is an amenable number.

20312069 is a deficient number, since it is larger than the sum of its proper divisors (20071).

20312069 is a wasteful number, since it uses less digits than its factorization.

20312069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20070.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20312069 is about 4506.8912789194. The cubic root of 20312069 is about 272.8462909451.

The spelling of 20312069 in words is "twenty million, three hundred twelve thousand, sixty-nine".