20155000550 has 24 divisors (see below), whose sum is σ = 37509562776. Its totient is φ = 8057427840.

The previous prime is 20155000543. The next prime is 20155000583. The reversal of 20155000550 is 5500055102.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24572 + ... + 202271.

It is an arithmetic number, because the mean of its divisors is an integer number (1562898449).

Almost surely, 2^20155000550 is an apocalyptic number.

20155000550 is a deficient number, since it is larger than the sum of its proper divisors (17354562226).

20155000550 is a wasteful number, since it uses less digits than its factorization.

20155000550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228632 (or 228627 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

Adding to 20155000550 its reverse (5500055102), we get a palindrome (25655055652).

The spelling of 20155000550 in words is "twenty billion, one hundred fifty-five million, five hundred fifty", and thus it is an aban number.