20591993466 has 24 divisors (see below), whose sum is σ = 48671985024. Its totient is φ = 6239997960.

The previous prime is 20591993453. The next prime is 20591993473. The reversal of 20591993466 is 66439919502.

20591993466 is a `hidden beast` number, since 2 + 0 + 5 + 91 + 9 + 93 + 466 = 666.

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 11 ways as a sum of consecutive naturals, for example, 51999786 + ... + 52000181.

It is an arithmetic number, because the mean of its divisors is an integer number (2027999376).

Almost surely, 2^20591993466 is an apocalyptic number.

20591993466 is an abundant number, since it is smaller than the sum of its proper divisors (28079991558).

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

20591993466 is a wasteful number, since it uses less digits than its factorization.

20591993466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103999986 (or 103999983 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 20591993466 in words is "twenty billion, five hundred ninety-one million, nine hundred ninety-three thousand, four hundred sixty-six".