20404241520 has 160 divisors (see below), whose sum is σ = 68199301632. Its totient is φ = 5016646656.

The previous prime is 20404241497. The next prime is 20404241521. The reversal of 20404241520 is 2514240402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404241521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3013659 + ... + 3020421.

Almost surely, 2^20404241520 is an apocalyptic number.

20404241520 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 20404241520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34099650816).

20404241520 is an abundant number, since it is smaller than the sum of its proper divisors (47795060112).

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

20404241520 is a wasteful number, since it uses less digits than its factorization.

20404241520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7759 (or 7753 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20404241520 its reverse (2514240402), we get a palindrome (22918481922).

The spelling of 20404241520 in words is "twenty billion, four hundred four million, two hundred forty-one thousand, five hundred twenty".