20145007780838 has 4 divisors (see below), whose sum is σ = 30217511671260. Its totient is φ = 10072503890418.

The previous prime is 20145007780829. The next prime is 20145007780853. The reversal of 20145007780838 is 83808770054102.

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

It is a super-2 number, since 2×20145007780838² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20145007780838.

It is a congruent number.

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, 5036251945208 + ... + 5036251945211.

It is an arithmetic number, because the mean of its divisors is an integer number (7554377917815).

Almost surely, 2^{20145007780838} is an apocalyptic number.

20145007780838 is a deficient number, since it is larger than the sum of its proper divisors (10072503890422).

20145007780838 is a wasteful number, since it uses less digits than its factorization.

20145007780838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072503890421.

The product of its (nonzero) digits is 3010560, while the sum is 53.

The spelling of 20145007780838 in words is "twenty trillion, one hundred forty-five billion, seven million, seven hundred eighty thousand, eight hundred thirty-eight".