20818123546 has 8 divisors (see below), whose sum is σ = 34066020384. Its totient is φ = 9462783420.

The previous prime is 20818123537. The next prime is 20818123583. The reversal of 20818123546 is 64532181802.

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

It is a super-2 number, since 2×20818123546² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20818123499 and 20818123508.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 473139150 + ... + 473139193.

It is an arithmetic number, because the mean of its divisors is an integer number (4258252548).

Almost surely, 2^20818123546 is an apocalyptic number.

20818123546 is a deficient number, since it is larger than the sum of its proper divisors (13247896838).

20818123546 is a wasteful number, since it uses less digits than its factorization.

20818123546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946278356.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 20818123546 in words is "twenty billion, eight hundred eighteen million, one hundred twenty-three thousand, five hundred forty-six".