231010405020 has 144 divisors (see below), whose sum is σ = 731469412128. Its totient is φ = 58955143680.

The previous prime is 231010405013. The next prime is 231010405027. The reversal of 231010405020 is 20504010132.

231010405020 is a `hidden beast` number, since 23 + 101 + 0 + 40 + 502 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (231010405013) and next prime (231010405027).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231010404984 and 231010405002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231010405027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121947 + ... + 690573.

Almost surely, 2^231010405020 is an apocalyptic number.

231010405020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231010405020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365734706064).

231010405020 is an abundant number, since it is smaller than the sum of its proper divisors (500459007108).

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

231010405020 is a wasteful number, since it uses less digits than its factorization.

231010405020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568740 (or 568735 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 231010405020 its reverse (20504010132), we get a palindrome (251514415152).

The spelling of 231010405020 in words is "two hundred thirty-one billion, ten million, four hundred five thousand, twenty".