20275949789642 has 4 divisors (see below), whose sum is σ = 30413924684466. Its totient is φ = 10137974894820.

The previous prime is 20275949789633. The next prime is 20275949789657. The reversal of 20275949789642 is 24698794957202.

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., 13620225732481 + 6655724057161 = 3690559^2 + 2579869^2 .

It is a super-2 number, since 2×20275949789642² (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 20275949789642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5068987447409 + ... + 5068987447412.

Almost surely, 2^{20275949789642} is an apocalyptic number.

20275949789642 is a deficient number, since it is larger than the sum of its proper divisors (10137974894824).

20275949789642 is a wasteful number, since it uses less digits than its factorization.

20275949789642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10137974894823.

The product of its (nonzero) digits is 1097349120, while the sum is 74.

The spelling of 20275949789642 in words is "twenty trillion, two hundred seventy-five billion, nine hundred forty-nine million, seven hundred eighty-nine thousand, six hundred forty-two".