20151201504 has 96 divisors (see below), whose sum is σ = 60704937216. Its totient is φ = 5733550080.

The previous prime is 20151201491. The next prime is 20151201523. The reversal of 20151201504 is 40510215102.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99739 + ... + 224165.

It is an arithmetic number, because the mean of its divisors is an integer number (632343096).

Almost surely, 2^20151201504 is an apocalyptic number.

20151201504 is a gapful number since it is divisible by the number (24) 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 20151201504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30352468608).

20151201504 is an abundant number, since it is smaller than the sum of its proper divisors (40553735712).

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

20151201504 is a wasteful number, since it uses less digits than its factorization.

20151201504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124688 (or 124680 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 20151201504 its reverse (40510215102), we get a palindrome (60661416606).

The spelling of 20151201504 in words is "twenty billion, one hundred fifty-one million, two hundred one thousand, five hundred four".