31045420 has 72 divisors (see below), whose sum is σ = 76991040. Its totient is φ = 10483200.

The previous prime is 31045409. The next prime is 31045429. The reversal of 31045420 is 2454013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31045429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77220 + ... + 77620.

It is an arithmetic number, because the mean of its divisors is an integer number (1069320).

Almost surely, 2^31045420 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 31045420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38495520).

31045420 is an abundant number, since it is smaller than the sum of its proper divisors (45945620).

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

31045420 is a wasteful number, since it uses less digits than its factorization.

31045420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31045420 is about 5571.8417062942. The cubic root of 31045420 is about 314.2914113489.

Adding to 31045420 its reverse (2454013), we get a palindrome (33499433).

It can be divided in two parts, 3 and 1045420, that multiplied together give a triangular number (3136260 = T₂₅₀₄).

The spelling of 31045420 in words is "thirty-one million, forty-five thousand, four hundred twenty".