20729908476 has 30 divisors (see below), whose sum is σ = 54192076400. Its totient is φ = 6909969384.

The previous prime is 20729908469. The next prime is 20729908481. The reversal of 20729908476 is 67480992702.

20729908476 is a `hidden beast` number, since 207 + 299 + 0 + 84 + 76 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31990276 + ... + 31990923.

Almost surely, 2^20729908476 is an apocalyptic number.

It is an amenable number.

20729908476 is an abundant number, since it is smaller than the sum of its proper divisors (33462167924).

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

20729908476 is a wasteful number, since it uses less digits than its factorization.

20729908476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63981215 (or 63981204 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 20729908476 in words is "twenty billion, seven hundred twenty-nine million, nine hundred eight thousand, four hundred seventy-six".