33120012020 has 48 divisors (see below), whose sum is σ = 73895023440. Its totient is φ = 12445461504.

The previous prime is 33120012019. The next prime is 33120012047. The reversal of 33120012020 is 2021002133.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 747366244 + 32372645776 = 27338^2 + 179924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 33120011986 and 33120012004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750209 + ... + 793128.

It is an arithmetic number, because the mean of its divisors is an integer number (1539479655).

Almost surely, 2^33120012020 is an apocalyptic number.

It is an amenable number.

33120012020 is an abundant number, since it is smaller than the sum of its proper divisors (40775011420).

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

33120012020 is a wasteful number, since it uses less digits than its factorization.

33120012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543412 (or 1543410 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 33120012020 its reverse (2021002133), we get a palindrome (35141014153).

The spelling of 33120012020 in words is "thirty-three billion, one hundred twenty million, twelve thousand, twenty".