20420431103 has 2 divisors, whose sum is σ = 20420431104. Its totient is φ = 20420431102.

The previous prime is 20420431069. The next prime is 20420431133. The reversal of 20420431103 is 30113402402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20420431103 - 2²⁶ = 20353322239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420431133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210215551 + 10210215552.

It is an arithmetic number, because the mean of its divisors is an integer number (10210215552).

Almost surely, 2^20420431103 is an apocalyptic number.

20420431103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420431103 is an equidigital number, since it uses as much as digits as its factorization.

20420431103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20420431103 its reverse (30113402402), we get a palindrome (50533833505).

The spelling of 20420431103 in words is "twenty billion, four hundred twenty million, four hundred thirty-one thousand, one hundred three".