20661316446 has 32 divisors (see below), whose sum is σ = 42473226240. Its totient is φ = 6695636256.

The previous prime is 20661316399. The next prime is 20661316451. The reversal of 20661316446 is 64461316602.

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 15 ways as a sum of consecutive naturals, for example, 247555 + ... + 320321.

It is an arithmetic number, because the mean of its divisors is an integer number (1327288320).

Almost surely, 2^20661316446 is an apocalyptic number.

20661316446 is an abundant number, since it is smaller than the sum of its proper divisors (21811909794).

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

20661316446 is a wasteful number, since it uses less digits than its factorization.

20661316446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74088.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 20661316446 in words is "twenty billion, six hundred sixty-one million, three hundred sixteen thousand, four hundred forty-six".