20312789355 has 12 divisors (see below), whose sum is σ = 35208834960. Its totient is φ = 10833487632.

The previous prime is 20312789351. The next prime is 20312789369. The reversal of 20312789355 is 55398721302.

20312789355 is a `hidden beast` number, since 20 + 3 + 1 + 278 + 9 + 355 = 666.

It is not a de Polignac number, because 20312789355 - 2² = 20312789351 is a prime.

It is a super-2 number, since 2×20312789355² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 451395319 = 20312789355 / (2 + 0 + 3 + 1 + 2 + 7 + 8 + 9 + 3 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 20312789355.

It is not an unprimeable number, because it can be changed into a prime (20312789351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225697615 + ... + 225697704.

It is an arithmetic number, because the mean of its divisors is an integer number (2934069580).

Almost surely, 2^20312789355 is an apocalyptic number.

20312789355 is a deficient number, since it is larger than the sum of its proper divisors (14896045605).

20312789355 is a wasteful number, since it uses less digits than its factorization.

20312789355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451395330 (or 451395327 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 20312789355 in words is "twenty billion, three hundred twelve million, seven hundred eighty-nine thousand, three hundred fifty-five".