20415051442 has 4 divisors (see below), whose sum is σ = 30622577166. Its totient is φ = 10207525720.

The previous prime is 20415051421. The next prime is 20415051451. The reversal of 20415051442 is 24415051402.

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., 20323638721 + 91412721 = 142561^2 + 9561^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20415051442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103762859 + ... + 5103762862.

Almost surely, 2^20415051442 is an apocalyptic number.

20415051442 is a deficient number, since it is larger than the sum of its proper divisors (10207525724).

20415051442 is a wasteful number, since it uses less digits than its factorization.

20415051442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10207525723.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 20415051442 in words is "twenty billion, four hundred fifteen million, fifty-one thousand, four hundred forty-two".