20379561047 has 4 divisors (see below), whose sum is σ = 20407906080. Its totient is φ = 20351216016.

The previous prime is 20379561043. The next prime is 20379561061. The reversal of 20379561047 is 74016597302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20379561047 - 2² = 20379561043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20379560989 and 20379561007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20379561043) 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, 14171438 + ... + 14172875.

It is an arithmetic number, because the mean of its divisors is an integer number (5101976520).

Almost surely, 2^20379561047 is an apocalyptic number.

20379561047 is a deficient number, since it is larger than the sum of its proper divisors (28345033).

20379561047 is an equidigital number, since it uses as much as digits as its factorization.

20379561047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28345032.

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

The spelling of 20379561047 in words is "twenty billion, three hundred seventy-nine million, five hundred sixty-one thousand, forty-seven".