20431603 has 8 divisors (see below), whose sum is σ = 21690288. Its totient is φ = 19179264.

The previous prime is 20431591. The next prime is 20431627. The reversal of 20431603 is 30613402.

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

It is not a de Polignac number, because 20431603 - 2⁹ = 20431091 is a prime.

It is a super-2 number, since 2×20431603² = 834900802299218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431673) 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, 6175 + ... + 8887.

It is an arithmetic number, because the mean of its divisors is an integer number (2711286).

Almost surely, 2^20431603 is an apocalyptic number.

20431603 is a deficient number, since it is larger than the sum of its proper divisors (1258685).

20431603 is a wasteful number, since it uses less digits than its factorization.

20431603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20431603 is about 4520.1330732623. The cubic root of 20431603 is about 273.3804666224.

The spelling of 20431603 in words is "twenty million, four hundred thirty-one thousand, six hundred three".