31372020 has 36 divisors (see below), whose sum is σ = 95162340. Its totient is φ = 8365824.

The previous prime is 31372009. The next prime is 31372027. The reversal of 31372020 is 2027313.

It can be written as a sum of positive squares in 2 ways, for example, as 23853456 + 7518564 = 4884^2 + 2742^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 31371984 and 31372002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31372027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86965 + ... + 87324.

Almost surely, 2^31372020 is an apocalyptic number.

31372020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31372020 is an abundant number, since it is smaller than the sum of its proper divisors (63790320).

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

31372020 is a wasteful number, since it uses less digits than its factorization.

31372020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174304 (or 174299 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31372020 is about 5601.0731114671. The cubic root of 31372020 is about 315.3896915548.

Adding to 31372020 its reverse (2027313), we get a palindrome (33399333).

The spelling of 31372020 in words is "thirty-one million, three hundred seventy-two thousand, twenty".