31420650220540 has 384 divisors, whose sum is σ = 86472562176000. Its totient is φ = 9338921754624.

The previous prime is 31420650220439. The next prime is 31420650220541. The reversal of 31420650220540 is 4502205602413.

It is a junction number, because it is equal to n+sod(n) for n = 31420650220496 and 31420650220505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420650220541) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 193308744 + ... + 193471216.

It is an arithmetic number, because the mean of its divisors is an integer number (225188964000).

Almost surely, 2^{31420650220540} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31420650220540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43236281088000).

31420650220540 is an abundant number, since it is smaller than the sum of its proper divisors (55051911955460).

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

31420650220540 is a wasteful number, since it uses less digits than its factorization.

31420650220540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162669 (or 162667 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 31420650220540 its reverse (4502205602413), we get a palindrome (35922855822953).

The spelling of 31420650220540 in words is "thirty-one trillion, four hundred twenty billion, six hundred fifty million, two hundred twenty thousand, five hundred forty".