20708263779 has 32 divisors (see below), whose sum is σ = 33266466816. Its totient is φ = 11207907360.

The previous prime is 20708263729. The next prime is 20708263783. The reversal of 20708263779 is 97736280702.

It is not a de Polignac number, because 20708263779 - 2⁸ = 20708263523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20708263729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307807 + ... + 369000.

It is an arithmetic number, because the mean of its divisors is an integer number (1039577088).

Almost surely, 2^20708263779 is an apocalyptic number.

20708263779 is a deficient number, since it is larger than the sum of its proper divisors (12558203037).

20708263779 is a wasteful number, since it uses less digits than its factorization.

20708263779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676895.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The spelling of 20708263779 in words is "twenty billion, seven hundred eight million, two hundred sixty-three thousand, seven hundred seventy-nine".