31662020 has 48 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 11437440.

The previous prime is 31662019. The next prime is 31662023. The reversal of 31662020 is 2026613.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31661983 and 31662001.

It is not an unprimeable number, because it can be changed into a prime (31662023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10925 + ... + 13515.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096).

Almost surely, 2^31662020 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 31662020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36578304).

31662020 is an abundant number, since it is smaller than the sum of its proper divisors (41494588).

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

31662020 is a wasteful number, since it uses less digits than its factorization.

31662020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31662020 is about 5626.9014563968. The cubic root of 31662020 is about 316.3585232702.

Adding to 31662020 its reverse (2026613), we get a palindrome (33688633).

The spelling of 31662020 in words is "thirty-one million, six hundred sixty-two thousand, twenty".