20321032140 has 120 divisors (see below), whose sum is σ = 63814470720. Its totient is φ = 5413277952.

The previous prime is 20321032139. The next prime is 20321032157. The reversal of 20321032140 is 4123012302.

20321032140 is a `hidden beast` number, since 20 + 321 + 0 + 321 + 4 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1677144 + ... + 1689216.

It is an arithmetic number, because the mean of its divisors is an integer number (531787256).

Almost surely, 2^20321032140 is an apocalyptic number.

20321032140 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 20321032140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31907235360).

20321032140 is an abundant number, since it is smaller than the sum of its proper divisors (43493438580).

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

20321032140 is a wasteful number, since it uses less digits than its factorization.

20321032140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13133 (or 13122 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20321032140 its reverse (4123012302), we get a palindrome (24444044442).

The spelling of 20321032140 in words is "twenty billion, three hundred twenty-one million, thirty-two thousand, one hundred forty".