31141920 has 48 divisors (see below), whose sum is σ = 98098560. Its totient is φ = 8304384.

The previous prime is 31141907. The next prime is 31141921. The reversal of 31141920 is 2914113.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (31141921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31960 + ... + 32919.

It is an arithmetic number, because the mean of its divisors is an integer number (2043720).

Almost surely, 2^31141920 is an apocalyptic number.

31141920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31141920 is an abundant number, since it is smaller than the sum of its proper divisors (66956640).

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

31141920 is a wasteful number, since it uses less digits than its factorization.

31141920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64897 (or 64889 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31141920 is about 5580.4946017356. The cubic root of 31141920 is about 314.6167169909.

The spelling of 31141920 in words is "thirty-one million, one hundred forty-one thousand, nine hundred twenty".