20415001550 has 24 divisors (see below), whose sum is σ = 38129485152. Its totient is φ = 8132112000.

The previous prime is 20415001513. The next prime is 20415001553. The reversal of 20415001550 is 5510051402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415001553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 835046 + ... + 859145.

It is an arithmetic number, because the mean of its divisors is an integer number (1588728548).

Almost surely, 2^20415001550 is an apocalyptic number.

20415001550 is a deficient number, since it is larger than the sum of its proper divisors (17714483602).

20415001550 is a wasteful number, since it uses less digits than its factorization.

20415001550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694444 (or 1694439 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 20415001550 its reverse (5510051402), we get a palindrome (25925052952).

The spelling of 20415001550 in words is "twenty billion, four hundred fifteen million, one thousand, five hundred fifty".