20269981205 has 6 divisors (see below), whose sum is σ = 24324359478. Its totient is φ = 16215730280.

The previous prime is 20269981189. The next prime is 20269981231. The reversal of 20269981205 is 50218996202.

It can be written as a sum of positive squares in only one way, i.e., 16215984964 + 4053996241 = 127342^2 + 63671^2 .

It is not a de Polignac number, because 20269981205 - 2⁴ = 20269981189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286520 + ... + 350190.

It is an arithmetic number, because the mean of its divisors is an integer number (4054059913).

Almost surely, 2^20269981205 is an apocalyptic number.

It is an amenable number.

20269981205 is a deficient number, since it is larger than the sum of its proper divisors (4054378273).

20269981205 is an frugal number, since it uses more digits than its factorization.

20269981205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127347 (or 63676 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 20269981205 in words is "twenty billion, two hundred sixty-nine million, nine hundred eighty-one thousand, two hundred five".