31220434 has 32 divisors (see below), whose sum is σ = 55440000. Its totient is φ = 12908160.

The previous prime is 31220429. The next prime is 31220447. The reversal of 31220434 is 43402213.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62317 + ... + 62815.

It is an arithmetic number, because the mean of its divisors is an integer number (1732500).

Almost surely, 2^31220434 is an apocalyptic number.

31220434 is a deficient number, since it is larger than the sum of its proper divisors (24219566).

31220434 is a wasteful number, since it uses less digits than its factorization.

31220434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31220434 is about 5587.5248545309. The cubic root of 31220434 is about 314.8808955944.

Adding to 31220434 its reverse (43402213), we get a palindrome (74622647).

The spelling of 31220434 in words is "thirty-one million, two hundred twenty thousand, four hundred thirty-four".