20500217424 has 50 divisors (see below), whose sum is σ = 59333580570. Its totient is φ = 6833405376.

The previous prime is 20500217407. The next prime is 20500217453. The reversal of 20500217424 is 42471200502.

20500217424 is a `hidden beast` number, since 20 + 5 + 0 + 0 + 217 + 424 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19359939600 + 1140277824 = 139140^2 + 33768^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7907739 + ... + 7910330.

Almost surely, 2^20500217424 is an apocalyptic number.

20500217424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20500217424 is an abundant number, since it is smaller than the sum of its proper divisors (38833363146).

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

20500217424 is a wasteful number, since it uses less digits than its factorization.

20500217424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15818089 (or 15818074 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

Adding to 20500217424 its reverse (42471200502), we get a palindrome (62971417926).

The spelling of 20500217424 in words is "twenty billion, five hundred million, two hundred seventeen thousand, four hundred twenty-four".