20780480 has 56 divisors (see below), whose sum is σ = 56558688. Its totient is φ = 7123968.

The previous prime is 20780479. The next prime is 20780483. The reversal of 20780480 is 8408702.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780483) by changing a digit.

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, 2399 + ... + 6878.

Almost surely, 2^20780480 is an apocalyptic number.

20780480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20780480 is an abundant number, since it is smaller than the sum of its proper divisors (35778208).

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

20780480 is an equidigital number, since it uses as much as digits as its factorization.

20780480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9301 (or 9291 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20780480 is about 4558.5611765117. The cubic root of 20780480 is about 274.9277165392.

The spelling of 20780480 in words is "twenty million, seven hundred eighty thousand, four hundred eighty".