20725191287 has 2 divisors, whose sum is σ = 20725191288. Its totient is φ = 20725191286.

The previous prime is 20725191251. The next prime is 20725191379. The reversal of 20725191287 is 78219152702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20725191287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20725190287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362595643 + 10362595644.

It is an arithmetic number, because the mean of its divisors is an integer number (10362595644).

Almost surely, 2^20725191287 is an apocalyptic number.

20725191287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725191287 is an equidigital number, since it uses as much as digits as its factorization.

20725191287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 20725191287 in words is "twenty billion, seven hundred twenty-five million, one hundred ninety-one thousand, two hundred eighty-seven".