18920447870 has 16 divisors (see below), whose sum is σ = 34301821680. Its totient is φ = 7513731264.

The previous prime is 18920447869. The next prime is 18920447879. The reversal of 18920447870 is 7874402981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18920447879) 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, 6804527 + ... + 6807306.

It is an arithmetic number, because the mean of its divisors is an integer number (2143863855).

Almost surely, 2^18920447870 is an apocalyptic number.

18920447870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18920447870 is a deficient number, since it is larger than the sum of its proper divisors (15381373810).

18920447870 is a wasteful number, since it uses less digits than its factorization.

18920447870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13611979.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 18920447870 in words is "eighteen billion, nine hundred twenty million, four hundred forty-seven thousand, eight hundred seventy".