31434320 has 20 divisors (see below), whose sum is σ = 73084980. Its totient is φ = 12573696.

The previous prime is 31434287. The next prime is 31434329. The reversal of 31434320 is 2343413.

It can be written as a sum of positive squares in 2 ways, for example, as 23116864 + 8317456 = 4808^2 + 2884^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 = 31434292 and 31434301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31434329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196385 + ... + 196544.

It is an arithmetic number, because the mean of its divisors is an integer number (3654249).

Almost surely, 2^31434320 is an apocalyptic number.

It is an amenable number.

31434320 is an abundant number, since it is smaller than the sum of its proper divisors (41650660).

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

31434320 is a wasteful number, since it uses less digits than its factorization.

31434320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392942 (or 392936 counting only the distinct ones).

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

The square root of 31434320 is about 5606.6317874460. The cubic root of 31434320 is about 315.5983252953.

Adding to 31434320 its reverse (2343413), we get a palindrome (33777733).

The spelling of 31434320 in words is "thirty-one million, four hundred thirty-four thousand, three hundred twenty".