31532020 has 72 divisors (see below), whose sum is σ = 75630240. Its totient is φ = 11007360.

The previous prime is 31532003. The next prime is 31532021. The reversal of 31532020 is 2023513.

It is a junction number, because it is equal to n+sod(n) for n = 31531985 and 31532003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31532021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63975 + ... + 64465.

It is an arithmetic number, because the mean of its divisors is an integer number (1050420).

Almost surely, 2^31532020 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 31532020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37815120).

31532020 is an abundant number, since it is smaller than the sum of its proper divisors (44098220).

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

31532020 is a wasteful number, since it uses less digits than its factorization.

31532020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 31532020 is about 5615.3379239365. The cubic root of 31532020 is about 315.9249541386.

Adding to 31532020 its reverse (2023513), we get a palindrome (33555533).

The spelling of 31532020 in words is "thirty-one million, five hundred thirty-two thousand, twenty".