20403430 has 16 divisors (see below), whose sum is σ = 36884160. Its totient is φ = 8126272.

The previous prime is 20403419. The next prime is 20403431. The reversal of 20403430 is 3430402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403431) 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, 1879 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (2305260).

Almost surely, 2^20403430 is an apocalyptic number.

20403430 is a deficient number, since it is larger than the sum of its proper divisors (16480730).

20403430 is a wasteful number, since it uses less digits than its factorization.

20403430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8783.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20403430 is about 4517.0156076773. The cubic root of 20403430 is about 273.2547546611.

Adding to 20403430 its reverse (3430402), we get a palindrome (23833832).

The spelling of 20403430 in words is "twenty million, four hundred three thousand, four hundred thirty".