20497669 has 8 divisors (see below), whose sum is σ = 21591360. Its totient is φ = 19420896.

The previous prime is 20497657. The next prime is 20497691. The reversal of 20497669 is 96679402.

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 20497669 - 2⁹ = 20497157 is a prime.

It is a super-2 number, since 2×20497669² = 840308868867122, 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 (20497619) 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, 1704 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^20497669 is an apocalyptic number.

It is an amenable number.

20497669 is a deficient number, since it is larger than the sum of its proper divisors (1093691).

20497669 is a wasteful number, since it uses less digits than its factorization.

20497669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8459.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 20497669 is about 4527.4351458635. The cubic root of 20497669 is about 273.6748100107.

The spelling of 20497669 in words is "twenty million, four hundred ninety-seven thousand, six hundred sixty-nine".