20155334004 has 120 divisors (see below), whose sum is σ = 56899664360. Its totient is φ = 6184532736.

The previous prime is 20155333997. The next prime is 20155334039. The reversal of 20155334004 is 40043355102.

20155334004 is a `hidden beast` number, since 201 + 5 + 53 + 3 + 400 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2652044004 + 17503290000 = 51498^2 + 132300^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1564662 + ... + 1577490.

Almost surely, 2^20155334004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155334004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28449832180).

20155334004 is an abundant number, since it is smaller than the sum of its proper divisors (36744330356).

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

20155334004 is a wasteful number, since it uses less digits than its factorization.

20155334004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13231 (or 13220 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 20155334004 its reverse (40043355102), we get a palindrome (60198689106).

The spelling of 20155334004 in words is "twenty billion, one hundred fifty-five million, three hundred thirty-four thousand, four".