20860881905 has 8 divisors (see below), whose sum is σ = 25113037992. Its totient is φ = 16635385728.

The previous prime is 20860881901. The next prime is 20860881919. The reversal of 20860881905 is 50918806802.

It can be written as a sum of positive squares in 4 ways, for example, as 570588769 + 20290293136 = 23887^2 + 142444^2 .

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 20860881905 - 2² = 20860881901 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 20860881905.

It is not an unprimeable number, because it can be changed into a prime (20860881901) 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, 6663254 + ... + 6666383.

It is an arithmetic number, because the mean of its divisors is an integer number (3139129749).

Almost surely, 2^20860881905 is an apocalyptic number.

It is an amenable number.

20860881905 is a deficient number, since it is larger than the sum of its proper divisors (4252156087).

20860881905 is a wasteful number, since it uses less digits than its factorization.

20860881905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13329955.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 20860881905 in words is "twenty billion, eight hundred sixty million, eight hundred eighty-one thousand, nine hundred five".