20436480 has 120 divisors (see below), whose sum is σ = 70857072. Its totient is φ = 5443584.

The previous prime is 20436473. The next prime is 20436487. The reversal of 20436480 is 8463402.

It is an interprime number because it is at equal distance from previous prime (20436473) and next prime (20436487).

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436487) 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 11 ways as a sum of consecutive naturals, for example, 22597 + ... + 23483.

Almost surely, 2^20436480 is an apocalyptic number.

20436480 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 20436480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35428536).

20436480 is an abundant number, since it is smaller than the sum of its proper divisors (50420592).

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

20436480 is an equidigital number, since it uses as much as digits as its factorization.

20436480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20436480 is about 4520.6725163409. The cubic root of 20436480 is about 273.4022167590.

Adding to 20436480 its reverse (8463402), we get a palindrome (28899882).

The spelling of 20436480 in words is "twenty million, four hundred thirty-six thousand, four hundred eighty".