20187278242 has 8 divisors (see below), whose sum is σ = 30580728732. Its totient is φ = 9993702000.

The previous prime is 20187278203. The next prime is 20187278257. The reversal of 20187278242 is 24287278102.

It can be written as a sum of positive squares in 2 ways, for example, as 19855346281 + 331931961 = 140909^2 + 18219^2 .

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

It is a super-3 number, since 3×20187278242³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 49968309 + ... + 49968712.

Almost surely, 2^20187278242 is an apocalyptic number.

20187278242 is a deficient number, since it is larger than the sum of its proper divisors (10393450490).

20187278242 is a wasteful number, since it uses less digits than its factorization.

20187278242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99937124.

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 20187278242 in words is "twenty billion, one hundred eighty-seven million, two hundred seventy-eight thousand, two hundred forty-two".