20988279361 has 4 divisors (see below), whose sum is σ = 23986604992. Its totient is φ = 17989953732.

The previous prime is 20988279349. The next prime is 20988279371. The reversal of 20988279361 is 16397288902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20988279361 - 2²³ = 20979890753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20988279331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499162805 + ... + 1499162818.

It is an arithmetic number, because the mean of its divisors is an integer number (5996651248).

Almost surely, 2^20988279361 is an apocalyptic number.

It is an amenable number.

20988279361 is a deficient number, since it is larger than the sum of its proper divisors (2998325631).

20988279361 is an equidigital number, since it uses as much as digits as its factorization.

20988279361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998325630.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 20988279361 in words is "twenty billion, nine hundred eighty-eight million, two hundred seventy-nine thousand, three hundred sixty-one".