20145863466 has 12 divisors (see below), whose sum is σ = 43649370882. Its totient is φ = 6715287816.

The previous prime is 20145863449. The next prime is 20145863503. The reversal of 20145863466 is 66436854102.

20145863466 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 5 + 8 + 634 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10199990025 + 9945873441 = 100995^2 + 99729^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 559607301 + ... + 559607336.

Almost surely, 2^20145863466 is an apocalyptic number.

20145863466 is an abundant number, since it is smaller than the sum of its proper divisors (23503507416).

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

20145863466 is a wasteful number, since it uses less digits than its factorization.

20145863466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119214645 (or 1119214642 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 20145863466 in words is "twenty billion, one hundred forty-five million, eight hundred sixty-three thousand, four hundred sixty-six".