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31620 = 22351731

31620 has 48 divisors (see below), whose sum is σ = 96768. Its totient is φ = 7680.

The previous prime is 31607. The next prime is 31627. The reversal of 31620 is 2613.

31620 = T25 + T26 + ... + T58.

31620 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31596 and 31605.

It is not an unprimeable number, because it can be changed into a prime (31627) by changing a digit.

31620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005 + ... + 1035.

It is an arithmetic number, because the mean of its divisors is an integer number (2016).

231620 is an apocalyptic number.

31620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48384).

31620 is an abundant number, since it is smaller than the sum of its proper divisors (65148).

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

31620 is a wasteful number, since it uses less digits than its factorization.

31620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 31620 is about 177.8201338432. The cubic root of 31620 is about 31.6218510407.

The spelling of 31620 in words is "thirty-one thousand, six hundred twenty".