20249671538 has 4 divisors (see below), whose sum is σ = 30374507310. Its totient is φ = 10124835768.

The previous prime is 20249671493. The next prime is 20249671543. The reversal of 20249671538 is 83517694202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16924188649 + 3325482889 = 130093^2 + 57667^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20249671492 and 20249671501.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5062417883 + ... + 5062417886.

It is a 1-persistent number, because it is pandigital, but 2⋅20249671538 = 40499343076 is not.

Almost surely, 2^20249671538 is an apocalyptic number.

20249671538 is a deficient number, since it is larger than the sum of its proper divisors (10124835772).

20249671538 is a wasteful number, since it uses less digits than its factorization.

20249671538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10124835771.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20249671538 in words is "twenty billion, two hundred forty-nine million, six hundred seventy-one thousand, five hundred thirty-eight".