20446666420 has 24 divisors (see below), whose sum is σ = 42942670848. Its totient is φ = 8177776800.

The previous prime is 20446666417. The next prime is 20446666439. The reversal of 20446666420 is 2466664402.

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 7 ways as a sum of consecutive naturals, for example, 151665 + ... + 252775.

It is an arithmetic number, because the mean of its divisors is an integer number (1789277952).

Almost surely, 2^20446666420 is an apocalyptic number.

20446666420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20446666420 is an abundant number, since it is smaller than the sum of its proper divisors (22496004428).

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

20446666420 is a wasteful number, since it uses less digits than its factorization.

20446666420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111231 (or 111229 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 20446666420 in words is "twenty billion, four hundred forty-six million, six hundred sixty-six thousand, four hundred twenty".