20429808664 has 32 divisors (see below), whose sum is σ = 39578401440. Its totient is φ = 9880998400.

The previous prime is 20429808661. The next prime is 20429808713. The reversal of 20429808664 is 46680892402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429808661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309217 + ... + 369424.

It is an arithmetic number, because the mean of its divisors is an integer number (1236825045).

Almost surely, 2^20429808664 is an apocalyptic number.

It is an amenable number.

20429808664 is a deficient number, since it is larger than the sum of its proper divisors (19148592776).

20429808664 is a wasteful number, since it uses less digits than its factorization.

20429808664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678771 (or 678767 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 20429808664 in words is "twenty billion, four hundred twenty-nine million, eight hundred eight thousand, six hundred sixty-four".