20036431 has 4 divisors (see below), whose sum is σ = 21091000. Its totient is φ = 18981864.

The previous prime is 20036389. The next prime is 20036461. The reversal of 20036431 is 13463002.

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 20036431 - 2⁹ = 20035919 is a prime.

It is a super-2 number, since 2×20036431² = 802917134435522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1054549 = 20036431 / (2 + 0 + 0 + 3 + 6 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20036399 and 20036408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20036461) 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, 527256 + ... + 527293.

It is an arithmetic number, because the mean of its divisors is an integer number (5272750).

Almost surely, 2^20036431 is an apocalyptic number.

20036431 is a deficient number, since it is larger than the sum of its proper divisors (1054569).

20036431 is a wasteful number, since it uses less digits than its factorization.

20036431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054568.

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

The square root of 20036431 is about 4476.2072114682. The cubic root of 20036431 is about 271.6064766014.

Adding to 20036431 its reverse (13463002), we get a palindrome (33499433).

The spelling of 20036431 in words is "twenty million, thirty-six thousand, four hundred thirty-one".