20131930 has 32 divisors (see below), whose sum is σ = 44601984. Its totient is φ = 6371136.

The previous prime is 20131919. The next prime is 20131931. The reversal of 20131930 is 3913102.

It is a junction number, because it is equal to n+sod(n) for n = 20131898 and 20131907.

It is not an unprimeable number, because it can be changed into a prime (20131931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10152 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (1393812).

Almost surely, 2^20131930 is an apocalyptic number.

20131930 is an abundant number, since it is smaller than the sum of its proper divisors (24470054).

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

20131930 is a wasteful number, since it uses less digits than its factorization.

20131930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22150.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 20131930 is about 4486.8619323532. The cubic root of 20131930 is about 272.0373092565.

It can be divided in two parts, 201 and 31930, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 20131930 in words is "twenty million, one hundred thirty-one thousand, nine hundred thirty".