20131333020 has 72 divisors (see below), whose sum is σ = 64657114704. Its totient is φ = 5052569088.

The previous prime is 20131332989. The next prime is 20131333021. The reversal of 20131333020 is 2033313102.

20131333020 is a `hidden beast` number, since 2 + 0 + 1 + 313 + 330 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20131332984 and 20131333002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131333021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3286374 + ... + 3292493.

It is an arithmetic number, because the mean of its divisors is an integer number (898015482).

Almost surely, 2^20131333020 is an apocalyptic number.

20131333020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131333020 is an abundant number, since it is smaller than the sum of its proper divisors (44525781684).

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

20131333020 is a wasteful number, since it uses less digits than its factorization.

20131333020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6578899 (or 6578894 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 20131333020 its reverse (2033313102), we get a palindrome (22164646122).

The spelling of 20131333020 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-three thousand, twenty".