20631403 has 8 divisors (see below), whose sum is σ = 22500800. Its totient is φ = 18802368.

The previous prime is 20631389. The next prime is 20631407. The reversal of 20631403 is 30413602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20631403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631407) 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, 9018 + ... + 11071.

It is an arithmetic number, because the mean of its divisors is an integer number (2812600).

Almost surely, 2^20631403 is an apocalyptic number.

20631403 is a deficient number, since it is larger than the sum of its proper divisors (1869397).

20631403 is a wasteful number, since it uses less digits than its factorization.

20631403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20181.

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

The square root of 20631403 is about 4542.1804235411. The cubic root of 20631403 is about 274.2687038501.

The spelling of 20631403 in words is "twenty million, six hundred thirty-one thousand, four hundred three".