20449394980 has 24 divisors (see below), whose sum is σ = 49078548288. Its totient is φ = 7011221088.

The previous prime is 20449394947. The next prime is 20449395011. The reversal of 20449394980 is 8949394402.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73033414 + ... + 73033693.

It is an arithmetic number, because the mean of its divisors is an integer number (2044939512).

Almost surely, 2^20449394980 is an apocalyptic number.

20449394980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20449394980 is an abundant number, since it is smaller than the sum of its proper divisors (28629153308).

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

20449394980 is a wasteful number, since it uses less digits than its factorization.

20449394980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146067123 (or 146067121 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 20449394980 in words is "twenty billion, four hundred forty-nine million, three hundred ninety-four thousand, nine hundred eighty".