20842480 has 40 divisors (see below), whose sum is σ = 49264704. Its totient is φ = 8198400.

The previous prime is 20842453. The next prime is 20842483. The reversal of 20842480 is 8424802.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2745 + ... + 7015.

Almost surely, 2^20842480 is an apocalyptic number.

20842480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20842480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24632352).

20842480 is an abundant number, since it is smaller than the sum of its proper divisors (28422224).

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

20842480 is a wasteful number, since it uses less digits than its factorization.

20842480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345 (or 4339 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 20842480 is about 4565.3565030565. The cubic root of 20842480 is about 275.2008670200.

The spelling of 20842480 in words is "twenty million, eight hundred forty-two thousand, four hundred eighty".