20247431009261 has 2 divisors, whose sum is σ = 20247431009262. Its totient is φ = 20247431009260.

The previous prime is 20247431009243. The next prime is 20247431009269. The reversal of 20247431009261 is 16290013474202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19872649515625 + 374781493636 = 4457875^2 + 612194^2 .

It is a cyclic number.

It is not a de Polignac number, because 20247431009261 - 2²² = 20247426814957 is a prime.

It is a super-2 number, since 2×20247431009261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20247431009269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10123715504630 + 10123715504631.

It is an arithmetic number, because the mean of its divisors is an integer number (10123715504631).

Almost surely, 2^{20247431009261} is an apocalyptic number.

It is an amenable number.

20247431009261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20247431009261 is an equidigital number, since it uses as much as digits as its factorization.

20247431009261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 20247431009261 in words is "twenty trillion, two hundred forty-seven billion, four hundred thirty-one million, nine thousand, two hundred sixty-one".