20203434431 has 2 divisors, whose sum is σ = 20203434432. Its totient is φ = 20203434430.

The previous prime is 20203434397. The next prime is 20203434443. The reversal of 20203434431 is 13443430202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20203434431 - 2⁶ = 20203434367 is a prime.

It is a super-2 number, since 2×20203434431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20203434431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203434451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101717215 + 10101717216.

It is an arithmetic number, because the mean of its divisors is an integer number (10101717216).

Almost surely, 2^20203434431 is an apocalyptic number.

20203434431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203434431 is an equidigital number, since it uses as much as digits as its factorization.

20203434431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 20203434431 its reverse (13443430202), we get a palindrome (33646864633).

The spelling of 20203434431 in words is "twenty billion, two hundred three million, four hundred thirty-four thousand, four hundred thirty-one".