31144020 has 24 divisors (see below), whose sum is σ = 87203424. Its totient is φ = 8305056.

The previous prime is 31143971. The next prime is 31144027. The reversal of 31144020 is 2044113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 259474 + ... + 259593.

It is an arithmetic number, because the mean of its divisors is an integer number (3633476).

Almost surely, 2^31144020 is an apocalyptic number.

31144020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31144020 is an abundant number, since it is smaller than the sum of its proper divisors (56059404).

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

31144020 is a wasteful number, since it uses less digits than its factorization.

31144020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519079 (or 519077 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31144020 is about 5580.6827539289. The cubic root of 31144020 is about 314.6237887049.

Adding to 31144020 its reverse (2044113), we get a palindrome (33188133).

The spelling of 31144020 in words is "thirty-one million, one hundred forty-four thousand, twenty".