20449671 has 8 divisors (see below), whose sum is σ = 29745024. Its totient is φ = 12393720.

The previous prime is 20449661. The next prime is 20449697. The reversal of 20449671 is 17694402.

It is a happy number.

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

It is not a de Polignac number, because 20449671 - 2¹⁸ = 20187527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 619687 = 20449671 / (2 + 0 + 4 + 4 + 9 + 6 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449601) 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, 309811 + ... + 309876.

It is an arithmetic number, because the mean of its divisors is an integer number (3718128).

Almost surely, 2^20449671 is an apocalyptic number.

20449671 is a deficient number, since it is larger than the sum of its proper divisors (9295353).

20449671 is a wasteful number, since it uses less digits than its factorization.

20449671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619701.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20449671 is about 4522.1312453311. The cubic root of 20449671 is about 273.4610278160.

The spelling of 20449671 in words is "twenty million, four hundred forty-nine thousand, six hundred seventy-one".