20431220160 has 896 divisors, whose sum is σ = 79636193280. Its totient is φ = 4385931264.

The previous prime is 20431220141. The next prime is 20431220179. The reversal of 20431220160 is 6102213402.

It is an interprime number because it is at equal distance from previous prime (20431220141) and next prime (20431220179).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 258623001 + ... + 258623079.

It is an arithmetic number, because the mean of its divisors is an integer number (88879680).

Almost surely, 2^20431220160 is an apocalyptic number.

20431220160 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 20431220160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39818096640).

20431220160 is an abundant number, since it is smaller than the sum of its proper divisors (59204973120).

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

20431220160 is a wasteful number, since it uses less digits than its factorization.

20431220160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20431220160 its reverse (6102213402), we get a palindrome (26533433562).

The spelling of 20431220160 in words is "twenty billion, four hundred thirty-one million, two hundred twenty thousand, one hundred sixty".