20011233550 has 192 divisors, whose sum is σ = 48487610880. Its totient is φ = 5963328000.

The previous prime is 20011233527. The next prime is 20011233577. The reversal of 20011233550 is 5533211002.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 8403360 + ... + 8405740.

It is an arithmetic number, because the mean of its divisors is an integer number (252539640).

Almost surely, 2^20011233550 is an apocalyptic number.

20011233550 is an abundant number, since it is smaller than the sum of its proper divisors (28476377330).

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

20011233550 is a wasteful number, since it uses less digits than its factorization.

20011233550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 20011233550 its reverse (5533211002), we get a palindrome (25544444552).

The spelling of 20011233550 in words is "twenty billion, eleven million, two hundred thirty-three thousand, five hundred fifty".