20602779005 has 16 divisors (see below), whose sum is σ = 26010848304. Its totient is φ = 15645611520.

The previous prime is 20602778993. The next prime is 20602779037. The reversal of 20602779005 is 50097720602.

It can be written as a sum of positive squares in 8 ways, for example, as 590149849 + 20012629156 = 24293^2 + 141466^2 .

It is not a de Polignac number, because 20602779005 - 2¹⁸ = 20602516861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20602779005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1350542 + ... + 1365711.

It is an arithmetic number, because the mean of its divisors is an integer number (1625678019).

Almost surely, 2^20602779005 is an apocalyptic number.

It is an amenable number.

20602779005 is a deficient number, since it is larger than the sum of its proper divisors (5408069299).

20602779005 is a wasteful number, since it uses less digits than its factorization.

20602779005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716336.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 20602779005 in words is "twenty billion, six hundred two million, seven hundred seventy-nine thousand, five".