20446623317646 has 20 divisors (see below), whose sum is σ = 45815581878792. Its totient is φ = 6815541105828.

The previous prime is 20446623317579. The next prime is 20446623317657. The reversal of 20446623317646 is 64671332664402.

20446623317646 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 6 + 623 + 3 + 1 + 7 + 6 + 4 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 20446623317592 and 20446623317601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63106861930 + ... + 63106862253.

Almost surely, 2^{20446623317646} is an apocalyptic number.

20446623317646 is an abundant number, since it is smaller than the sum of its proper divisors (25368958561146).

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

20446623317646 is a wasteful number, since it uses less digits than its factorization.

20446623317646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126213724197 (or 126213724188 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 54.

The spelling of 20446623317646 in words is "twenty trillion, four hundred forty-six billion, six hundred twenty-three million, three hundred seventeen thousand, six hundred forty-six".