20727131251 has 2 divisors, whose sum is σ = 20727131252. Its totient is φ = 20727131250.

The previous prime is 20727131213. The next prime is 20727131263. The reversal of 20727131251 is 15213172702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20727131251 is a prime.

It is a super-2 number, since 2×20727131251² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20727131281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363565625 + 10363565626.

It is an arithmetic number, because the mean of its divisors is an integer number (10363565626).

Almost surely, 2^20727131251 is an apocalyptic number.

20727131251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727131251 is an equidigital number, since it uses as much as digits as its factorization.

20727131251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 20727131251 in words is "twenty billion, seven hundred twenty-seven million, one hundred thirty-one thousand, two hundred fifty-one".