20312669 has 4 divisors (see below), whose sum is σ = 21875196. Its totient is φ = 18750144.

The previous prime is 20312639. The next prime is 20312681. The reversal of 20312669 is 96621302.

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 1276900 + 19035769 = 1130^2 + 4363^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312669 - 2¹² = 20308573 is a prime.

It is a super-2 number, since 2×20312669² = 825209043807122, 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 (20312629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781244 + ... + 781269.

It is an arithmetic number, because the mean of its divisors is an integer number (5468799).

Almost surely, 2^20312669 is an apocalyptic number.

It is an amenable number.

20312669 is a deficient number, since it is larger than the sum of its proper divisors (1562527).

20312669 is a wasteful number, since it uses less digits than its factorization.

20312669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562526.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20312669 is about 4506.9578431576. The cubic root of 20312669 is about 272.8489774622.

The spelling of 20312669 in words is "twenty million, three hundred twelve thousand, six hundred sixty-nine".