31534420 has 12 divisors (see below), whose sum is σ = 66222324. Its totient is φ = 12613760.

The previous prime is 31534411. The next prime is 31534423. The reversal of 31534420 is 2443513.

It can be written as a sum of positive squares in 2 ways, for example, as 12068676 + 19465744 = 3474^2 + 4412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31534391 and 31534400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31534423) 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, 788341 + ... + 788380.

It is an arithmetic number, because the mean of its divisors is an integer number (5518527).

Almost surely, 2^31534420 is an apocalyptic number.

It is an amenable number.

31534420 is an abundant number, since it is smaller than the sum of its proper divisors (34687904).

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

31534420 is a wasteful number, since it uses less digits than its factorization.

31534420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576730 (or 1576728 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 31534420 is about 5615.5516202774. The cubic root of 31534420 is about 315.9329692785.

Adding to 31534420 its reverse (2443513), we get a palindrome (33977933).

The spelling of 31534420 in words is "thirty-one million, five hundred thirty-four thousand, four hundred twenty".