20018700337 has 4 divisors (see below), whose sum is σ = 20664464896. Its totient is φ = 19372935780.

The previous prime is 20018700329. The next prime is 20018700343. The reversal of 20018700337 is 73300781002.

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 20018700337 - 2³ = 20018700329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 645764527 = 20018700337 / (2 + 0 + 0 + 1 + 8 + 7 + 0 + 0 + 3 + 3 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20018700299 and 20018700308.

It is not an unprimeable number, because it can be changed into a prime (20018700347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322882233 + ... + 322882294.

It is an arithmetic number, because the mean of its divisors is an integer number (5166116224).

Almost surely, 2^20018700337 is an apocalyptic number.

It is an amenable number.

20018700337 is a deficient number, since it is larger than the sum of its proper divisors (645764559).

20018700337 is an equidigital number, since it uses as much as digits as its factorization.

20018700337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645764558.

The product of its (nonzero) digits is 7056, while the sum is 31.

The spelling of 20018700337 in words is "twenty billion, eighteen million, seven hundred thousand, three hundred thirty-seven".