20198259644 has 6 divisors (see below), whose sum is σ = 35346954384. Its totient is φ = 10099129820.

The previous prime is 20198259637. The next prime is 20198259647. The reversal of 20198259644 is 44695289102.

It is a super-3 number, since 3×20198259644³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20198259592 and 20198259601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20198259647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2524782452 + ... + 2524782459.

It is an arithmetic number, because the mean of its divisors is an integer number (5891159064).

Almost surely, 2^20198259644 is an apocalyptic number.

It is an amenable number.

20198259644 is a deficient number, since it is larger than the sum of its proper divisors (15148694740).

20198259644 is a wasteful number, since it uses less digits than its factorization.

20198259644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049564915 (or 5049564913 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 20198259644 in words is "twenty billion, one hundred ninety-eight million, two hundred fifty-nine thousand, six hundred forty-four".