20906271790506 has 12 divisors (see below), whose sum is σ = 45296922212802. Its totient is φ = 6968757263496.

The previous prime is 20906271790489. The next prime is 20906271790517. The reversal of 20906271790506 is 60509717260902.

20906271790506 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 62 + 7 + 1 + 79 + 0 + 506 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13865129935281 + 7041141855225 = 3723591^2 + 2653515^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 580729771941 + ... + 580729771976.

Almost surely, 2^{20906271790506} is an apocalyptic number.

20906271790506 is an abundant number, since it is smaller than the sum of its proper divisors (24390650422296).

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

20906271790506 is a wasteful number, since it uses less digits than its factorization.

20906271790506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161459543925 (or 1161459543922 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 20906271790506 in words is "twenty trillion, nine hundred six billion, two hundred seventy-one million, seven hundred ninety thousand, five hundred six".