20015336540 has 96 divisors (see below), whose sum is σ = 43766702784. Its totient is φ = 7683287040.

The previous prime is 20015336513. The next prime is 20015336543. The reversal of 20015336540 is 4563351002.

It is a super-2 number, since 2×20015336540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015336543) 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, 13774454 + ... + 13775906.

It is an arithmetic number, because the mean of its divisors is an integer number (455903154).

Almost surely, 2^20015336540 is an apocalyptic number.

20015336540 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 20015336540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21883351392).

20015336540 is an abundant number, since it is smaller than the sum of its proper divisors (23751366244).

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

20015336540 is a wasteful number, since it uses less digits than its factorization.

20015336540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20015336540 its reverse (4563351002), we get a palindrome (24578687542).

The spelling of 20015336540 in words is "twenty billion, fifteen million, three hundred thirty-six thousand, five hundred forty".