20533413431 has 4 divisors (see below), whose sum is σ = 21241462200. Its totient is φ = 19825364664.

The previous prime is 20533413391. The next prime is 20533413437. The reversal of 20533413431 is 13431433502.

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 20533413431 - 2¹⁴ = 20533397047 is a prime.

It is a super-2 number, since 2×20533413431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 708048739 = 20533413431 / (2 + 0 + 5 + 3 + 3 + 4 + 1 + 3 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20533413394 and 20533413403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533413437) 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, 354024341 + ... + 354024398.

It is an arithmetic number, because the mean of its divisors is an integer number (5310365550).

Almost surely, 2^20533413431 is an apocalyptic number.

20533413431 is a deficient number, since it is larger than the sum of its proper divisors (708048769).

20533413431 is an equidigital number, since it uses as much as digits as its factorization.

20533413431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708048768.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 20533413431 its reverse (13431433502), we get a palindrome (33964846933).

The spelling of 20533413431 in words is "twenty billion, five hundred thirty-three million, four hundred thirteen thousand, four hundred thirty-one".