20209278418506 has 20 divisors (see below), whose sum is σ = 45283753493682. Its totient is φ = 6736426139448.

The previous prime is 20209278418451. The next prime is 20209278418523. The reversal of 20209278418506 is 60581487290202.

20209278418506 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 92 + 7 + 8 + 41 + 8 + 506 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19401690420225 + 807587998281 = 4404735^2 + 898659^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62374315945 + ... + 62374316268.

Almost surely, 2^{20209278418506} is an apocalyptic number.

20209278418506 is an abundant number, since it is smaller than the sum of its proper divisors (25074475075176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20209278418506 is a wasteful number, since it uses less digits than its factorization.

20209278418506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124748632227 (or 124748632218 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 20209278418506 in words is "twenty trillion, two hundred nine billion, two hundred seventy-eight million, four hundred eighteen thousand, five hundred six".