20430436 has 12 divisors (see below), whose sum is σ = 38503612. Its totient is φ = 9429408.

The previous prime is 20430409. The next prime is 20430439. The reversal of 20430436 is 63403402.

It can be written as a sum of positive squares in 2 ways, for example, as 3041536 + 17388900 = 1744^2 + 4170^2 .

It is not an unprimeable number, because it can be changed into a prime (20430439) 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, 196395 + ... + 196498.

Almost surely, 2^20430436 is an apocalyptic number.

20430436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20430436 is a deficient number, since it is larger than the sum of its proper divisors (18073176).

20430436 is a wasteful number, since it uses less digits than its factorization.

20430436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392910 (or 392908 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 20430436 is about 4520.0039822991. The cubic root of 20430436 is about 273.3752615963.

Adding to 20430436 its reverse (63403402), we get a palindrome (83833838).

It can be divided in two parts, 204304 and 36, that multiplied together give a square (7354944 = 2712²).

The spelling of 20430436 in words is "twenty million, four hundred thirty thousand, four hundred thirty-six".