31633226020 has 72 divisors (see below), whose sum is σ = 73551599352. Its totient is φ = 11418908160.

The previous prime is 31633225993. The next prime is 31633226021. The reversal of 31633226020 is 2062233613.

It can be written as a sum of positive squares in 4 ways, for example, as 1327290624 + 30305935396 = 36432^2 + 174086^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31633226020.

It is not an unprimeable number, because it can be changed into a prime (31633226021) 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, 283834 + ... + 379246.

It is an arithmetic number, because the mean of its divisors is an integer number (1021549991).

Almost surely, 2^31633226020 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 31633226020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36775799676).

31633226020 is an abundant number, since it is smaller than the sum of its proper divisors (41918373332).

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

31633226020 is a wasteful number, since it uses less digits than its factorization.

31633226020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95581 (or 95568 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 31633226020 its reverse (2062233613), we get a palindrome (33695459633).

The spelling of 31633226020 in words is "thirty-one billion, six hundred thirty-three million, two hundred twenty-six thousand, twenty".