20827595249 has 2 divisors, whose sum is σ = 20827595250. Its totient is φ = 20827595248.

The previous prime is 20827595233. The next prime is 20827595309. The reversal of 20827595249 is 94259572802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18368923024 + 2458672225 = 135532^2 + 49585^2 .

It is a cyclic number.

It is not a de Polignac number, because 20827595249 - 2⁴ = 20827595233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20827595249.

It is not a weakly prime, because it can be changed into another prime (20827595209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413797624 + 10413797625.

It is an arithmetic number, because the mean of its divisors is an integer number (10413797625).

Almost surely, 2^20827595249 is an apocalyptic number.

It is an amenable number.

20827595249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20827595249 is an equidigital number, since it uses as much as digits as its factorization.

20827595249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 20827595249 in words is "twenty billion, eight hundred twenty-seven million, five hundred ninety-five thousand, two hundred forty-nine".