31433420 has 24 divisors (see below), whose sum is σ = 66620400. Its totient is φ = 12457152.

The previous prime is 31433401. The next prime is 31433431. The reversal of 31433420 is 2433413.

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 = 31433392 and 31433401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5030 + ... + 9389.

It is an arithmetic number, because the mean of its divisors is an integer number (2775850).

Almost surely, 2^31433420 is an apocalyptic number.

It is an amenable number.

31433420 is an abundant number, since it is smaller than the sum of its proper divisors (35186980).

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

31433420 is a wasteful number, since it uses less digits than its factorization.

31433420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14537 (or 14535 counting only the distinct ones).

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

The square root of 31433420 is about 5606.5515247788. The cubic root of 31433420 is about 315.5953132880.

Adding to 31433420 its reverse (2433413), we get a palindrome (33866833).

The spelling of 31433420 in words is "thirty-one million, four hundred thirty-three thousand, four hundred twenty".