20315501212650 has 192 divisors, whose sum is σ = 57749634858240. Its totient is φ = 4629866803200.

The previous prime is 20315501212627. The next prime is 20315501212763. The reversal of 20315501212650 is 5621210551302.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1313975920 + ... + 1313991380.

It is an arithmetic number, because the mean of its divisors is an integer number (300779348220).

Almost surely, 2^{20315501212650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20315501212650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28874817429120).

20315501212650 is an abundant number, since it is smaller than the sum of its proper divisors (37434133645590).

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

20315501212650 is a wasteful number, since it uses less digits than its factorization.

20315501212650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19089 (or 19084 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 20315501212650 its reverse (5621210551302), we get a palindrome (25936711763952).

The spelling of 20315501212650 in words is "twenty trillion, three hundred fifteen billion, five hundred one million, two hundred twelve thousand, six hundred fifty".