20445493898 has 8 divisors (see below), whose sum is σ = 30669483492. Its totient is φ = 10222332736.

The previous prime is 20445493807. The next prime is 20445493919. The reversal of 20445493898 is 89839454402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18930182569 + 1515311329 = 137587^2 + 38927^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141215 + ... + 246642.

Almost surely, 2^20445493898 is an apocalyptic number.

20445493898 is a deficient number, since it is larger than the sum of its proper divisors (10223989594).

20445493898 is a wasteful number, since it uses less digits than its factorization.

20445493898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414216.

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 20445493898 in words is "twenty billion, four hundred forty-five million, four hundred ninety-three thousand, eight hundred ninety-eight".