20520444431 has 2 divisors, whose sum is σ = 20520444432. Its totient is φ = 20520444430.

The previous prime is 20520444409. The next prime is 20520444569. The reversal of 20520444431 is 13444402502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20520444431 is a prime.

It is a super-2 number, since 2×20520444431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20520444394 and 20520444403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20520444331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260222215 + 10260222216.

It is an arithmetic number, because the mean of its divisors is an integer number (10260222216).

Almost surely, 2^20520444431 is an apocalyptic number.

20520444431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520444431 is an equidigital number, since it uses as much as digits as its factorization.

20520444431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 20520444431 its reverse (13444402502), we get a palindrome (33964846933).

The spelling of 20520444431 in words is "twenty billion, five hundred twenty million, four hundred forty-four thousand, four hundred thirty-one".