20550050100 has 108 divisors (see below), whose sum is σ = 64562974476. Its totient is φ = 5467253760.

The previous prime is 20550050099. The next prime is 20550050117. The reversal of 20550050100 is 105005502.

It can be written as a sum of positive squares in 6 ways, for example, as 4912047396 + 15638002704 = 70086^2 + 125052^2 .

It is a super-2 number, since 2×20550050100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 363334 + ... + 416066.

Almost surely, 2^20550050100 is an apocalyptic number.

20550050100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20550050100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32281487238).

20550050100 is an abundant number, since it is smaller than the sum of its proper divisors (44012924376).

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

20550050100 is a wasteful number, since it uses less digits than its factorization.

20550050100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53186 (or 53176 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

Adding to 20550050100 its reverse (105005502), we get a palindrome (20655055602).

The spelling of 20550050100 in words is "twenty billion, five hundred fifty million, fifty thousand, one hundred".