20257673 has 8 divisors (see below), whose sum is σ = 20675016. Its totient is φ = 19843200.

The previous prime is 20257669. The next prime is 20257697. The reversal of 20257673 is 37675202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 659344 + 19598329 = 812^2 + 4427^2 .

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 20257673 - 2² = 20257669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20257613) 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, 18563 + ... + 19623.

It is an arithmetic number, because the mean of its divisors is an integer number (2584377).

Almost surely, 2^20257673 is an apocalyptic number.

It is an amenable number.

20257673 is a deficient number, since it is larger than the sum of its proper divisors (417343).

20257673 is a wasteful number, since it uses less digits than its factorization.

20257673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 20257673 is about 4500.8524748096. The cubic root of 20257673 is about 272.6025111610.

It can be divided in two parts, 202 and 57673, that added together give a palindrome (57875).

The spelling of 20257673 in words is "twenty million, two hundred fifty-seven thousand, six hundred seventy-three".