20446780 has 24 divisors (see below), whose sum is σ = 43485120. Its totient is φ = 8074560.

The previous prime is 20446729. The next prime is 20446799. The reversal of 20446780 is 8764402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4891 + ... + 8050.

It is an arithmetic number, because the mean of its divisors is an integer number (1811880).

Almost surely, 2^20446780 is an apocalyptic number.

20446780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20446780 is an abundant number, since it is smaller than the sum of its proper divisors (23038340).

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

20446780 is a wasteful number, since it uses less digits than its factorization.

20446780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13029 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20446780 is about 4521.8115838677. The cubic root of 20446780 is about 273.4481406798.

The spelling of 20446780 in words is "twenty million, four hundred forty-six thousand, seven hundred eighty".