20004013520 has 40 divisors (see below), whose sum is σ = 46529164800. Its totient is φ = 7998193280.

The previous prime is 20004013517. The next prime is 20004013541. The reversal of 20004013520 is 2531040002.

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

It is a congruent number.

It is an unprimeable number.

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, 139805 + ... + 244035.

It is an arithmetic number, because the mean of its divisors is an integer number (1163229120).

Almost surely, 2^20004013520 is an apocalyptic number.

20004013520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20004013520 is an abundant number, since it is smaller than the sum of its proper divisors (26525151280).

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

20004013520 is a wasteful number, since it uses less digits than its factorization.

20004013520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106643 (or 106637 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 20004013520 its reverse (2531040002), we get a palindrome (22535053522).

The spelling of 20004013520 in words is "twenty billion, four million, thirteen thousand, five hundred twenty".