31334420 has 48 divisors (see below), whose sum is σ = 74605440. Its totient is φ = 10958976.

The previous prime is 31334411. The next prime is 31334423. The reversal of 31334420 is 2443313.

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 = 31334392 and 31334401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31334423) 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, 1769 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (1554280).

Almost surely, 2^31334420 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 31334420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37302720).

31334420 is an abundant number, since it is smaller than the sum of its proper divisors (43271020).

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

31334420 is a wasteful number, since it uses less digits than its factorization.

31334420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384 (or 6382 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 31334420 is about 5597.7156054948. The cubic root of 31334420 is about 315.2636408769.

Adding to 31334420 its reverse (2443313), we get a palindrome (33777733).

The spelling of 31334420 in words is "thirty-one million, three hundred thirty-four thousand, four hundred twenty".