20291669 has 4 divisors (see below), whose sum is σ = 20413344. Its totient is φ = 20169996.

The previous prime is 20291653. The next prime is 20291671. The reversal of 20291669 is 96619202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96619202 = 2 ⋅48309601.

It is a cyclic number.

It is not a de Polignac number, because 20291669 - 2⁴ = 20291653 is a prime.

It is a super-2 number, since 2×20291669² = 823503661611122, 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 (20291699) 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, 60587 + ... + 60920.

It is an arithmetic number, because the mean of its divisors is an integer number (5103336).

Almost surely, 2^20291669 is an apocalyptic number.

It is an amenable number.

20291669 is a deficient number, since it is larger than the sum of its proper divisors (121675).

20291669 is a wasteful number, since it uses less digits than its factorization.

20291669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121674.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20291669 is about 4504.6275095728. The cubic root of 20291669 is about 272.7549178677.

The spelling of 20291669 in words is "twenty million, two hundred ninety-one thousand, six hundred sixty-nine".