20447201938 has 16 divisors (see below), whose sum is σ = 31104894240. Its totient is φ = 10079566816.

The previous prime is 20447201921. The next prime is 20447201959. The reversal of 20447201938 is 83910274402.

It is a self number, because there is not a number n which added to its sum of digits gives 20447201938.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103756 + ... + 227287.

It is an arithmetic number, because the mean of its divisors is an integer number (1944055890).

Almost surely, 2^20447201938 is an apocalyptic number.

20447201938 is a deficient number, since it is larger than the sum of its proper divisors (10657692302).

20447201938 is a wasteful number, since it uses less digits than its factorization.

20447201938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331481.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 20447201938 in words is "twenty billion, four hundred forty-seven million, two hundred one thousand, nine hundred thirty-eight".