20661469 has 8 divisors (see below), whose sum is σ = 21542400. Its totient is φ = 19794000.

The previous prime is 20661463. The next prime is 20661523. The reversal of 20661469 is 96416602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20661469 - 2⁵ = 20661437 is a prime.

It is a super-2 number, since 2×20661469² = 853792602475922, 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 (20661463) 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, 169 + ... + 6430.

It is an arithmetic number, because the mean of its divisors is an integer number (2692800).

Almost surely, 2^20661469 is an apocalyptic number.

It is an amenable number.

20661469 is a deficient number, since it is larger than the sum of its proper divisors (880931).

20661469 is a wasteful number, since it uses less digits than its factorization.

20661469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20661469 is about 4545.4888625977. The cubic root of 20661469 is about 274.4018691418.

The spelling of 20661469 in words is "twenty million, six hundred sixty-one thousand, four hundred sixty-nine".