20258011531 has 2 divisors, whose sum is σ = 20258011532. Its totient is φ = 20258011530.

The previous prime is 20258011513. The next prime is 20258011559. The reversal of 20258011531 is 13511085202.

Together with previous prime (20258011513) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (20258011559) can be obtained adding 20258011531 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20258011531 - 2²¹ = 20255914379 is a prime.

It is a super-2 number, since 2×20258011531² (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 20258011531.

It is not a weakly prime, because it can be changed into another prime (20258011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129005765 + 10129005766.

It is an arithmetic number, because the mean of its divisors is an integer number (10129005766).

Almost surely, 2^20258011531 is an apocalyptic number.

20258011531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20258011531 is an equidigital number, since it uses as much as digits as its factorization.

20258011531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 20258011531 its reverse (13511085202), we get a palindrome (33769096733).

The spelling of 20258011531 in words is "twenty billion, two hundred fifty-eight million, eleven thousand, five hundred thirty-one".