20505859263 has 16 divisors (see below), whose sum is σ = 30383249760. Its totient is φ = 13668683328.

The previous prime is 20505859259. The next prime is 20505859271. The reversal of 20505859263 is 36295850502.

20505859263 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 58 + 592 + 6 + 3 = 666.

It is not a de Polignac number, because 20505859263 - 2² = 20505859259 is a prime.

It is a super-2 number, since 2×20505859263² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505859063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162481 + ... + 259637.

It is an arithmetic number, because the mean of its divisors is an integer number (1898953110).

Almost surely, 2^20505859263 is an apocalyptic number.

20505859263 is a deficient number, since it is larger than the sum of its proper divisors (9877390497).

20505859263 is an equidigital number, since it uses as much as digits as its factorization.

20505859263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104983 (or 104977 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 20505859263 in words is "twenty billion, five hundred five million, eight hundred fifty-nine thousand, two hundred sixty-three".