20115215450 has 72 divisors (see below), whose sum is σ = 43289520960. Its totient is φ = 6929604000.

The previous prime is 20115215441. The next prime is 20115215459. The reversal of 20115215450 is 5451251102.

It is an interprime number because it is at equal distance from previous prime (20115215441) and next prime (20115215459).

It is not an unprimeable number, because it can be changed into a prime (20115215459) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 27455 + ... + 202445.

Almost surely, 2^20115215450 is an apocalyptic number.

20115215450 is an abundant number, since it is smaller than the sum of its proper divisors (23174305510).

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

20115215450 is a wasteful number, since it uses less digits than its factorization.

20115215450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175044 (or 175028 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 20115215450 its reverse (5451251102), we get a palindrome (25566466552).

The spelling of 20115215450 in words is "twenty billion, one hundred fifteen million, two hundred fifteen thousand, four hundred fifty".