20195639398 has 8 divisors (see below), whose sum is σ = 33047409960. Its totient is φ = 9179836080.

The previous prime is 20195639377. The next prime is 20195639423. The reversal of 20195639398 is 89393659102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 458991783 + ... + 458991826.

It is an arithmetic number, because the mean of its divisors is an integer number (4130926245).

Almost surely, 2^20195639398 is an apocalyptic number.

20195639398 is a deficient number, since it is larger than the sum of its proper divisors (12851770562).

20195639398 is a wasteful number, since it uses less digits than its factorization.

20195639398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917983622.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 20195639398 in words is "twenty billion, one hundred ninety-five million, six hundred thirty-nine thousand, three hundred ninety-eight".