20831403 has 8 divisors (see below), whose sum is σ = 28452816. Its totient is φ = 13548800.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831403 is 30413802.

It is a happy number.

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 20831403 - 2⁸ = 20831147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20831403.

It is not an unprimeable number, because it can be changed into a prime (20831003) 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, 84558 + ... + 84803.

It is an arithmetic number, because the mean of its divisors is an integer number (3556602).

Almost surely, 2^20831403 is an apocalyptic number.

20831403 is a deficient number, since it is larger than the sum of its proper divisors (7621413).

20831403 is a wasteful number, since it uses less digits than its factorization.

20831403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169405.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20831403 is about 4564.1431835559. The cubic root of 20831403 is about 275.1521053851.

It can be divided in two parts, 2083 and 1403, that added together give a triangular number (3486 = T₈₃).

The spelling of 20831403 in words is "twenty million, eight hundred thirty-one thousand, four hundred three".