31423620 has 48 divisors (see below), whose sum is σ = 88260480. Its totient is φ = 8353536.

The previous prime is 31423573. The next prime is 31423621. The reversal of 31423620 is 2632413.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31423621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25744 + ... + 26936.

It is an arithmetic number, because the mean of its divisors is an integer number (1838760).

Almost surely, 2^31423620 is an apocalyptic number.

31423620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31423620 is an abundant number, since it is smaller than the sum of its proper divisors (56836860).

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

31423620 is a wasteful number, since it uses less digits than its factorization.

31423620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 31423620 is about 5605.6774791277. The cubic root of 31423620 is about 315.5625121531.

The spelling of 31423620 in words is "thirty-one million, four hundred twenty-three thousand, six hundred twenty".