20434403 has 4 divisors (see below), whose sum is σ = 22292088. Its totient is φ = 18576720.

The previous prime is 20434387. The next prime is 20434409. The reversal of 20434403 is 30443402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20434403 - 2⁴ = 20434387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928826 + ... + 928847.

It is an arithmetic number, because the mean of its divisors is an integer number (5573022).

Almost surely, 2^20434403 is an apocalyptic number.

20434403 is a deficient number, since it is larger than the sum of its proper divisors (1857685).

20434403 is a wasteful number, since it uses less digits than its factorization.

20434403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857684.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20434403 is about 4520.4427880463. The cubic root of 20434403 is about 273.3929543086.

Adding to 20434403 its reverse (30443402), we get a palindrome (50877805).

It can be divided in two parts, 2043 and 4403, that added together give a palindrome (6446).

The spelling of 20434403 in words is "twenty million, four hundred thirty-four thousand, four hundred three".