20279760605 has 8 divisors (see below), whose sum is σ = 26207690712. Its totient is φ = 14975823168.

The previous prime is 20279760563. The next prime is 20279760607. The reversal of 20279760605 is 50606797202.

It can be written as a sum of positive squares in 4 ways, for example, as 4019940409 + 16259820196 = 63403^2 + 127514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20279760605 - 2¹² = 20279756509 is a prime.

It is a super-2 number, since 2×20279760605² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279760607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155998094 + ... + 155998223.

It is an arithmetic number, because the mean of its divisors is an integer number (3275961339).

Almost surely, 2^20279760605 is an apocalyptic number.

It is an amenable number.

20279760605 is a deficient number, since it is larger than the sum of its proper divisors (5927930107).

20279760605 is a wasteful number, since it uses less digits than its factorization.

20279760605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311996335.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 20279760605 in words is "twenty billion, two hundred seventy-nine million, seven hundred sixty thousand, six hundred five".