20535222420 has 144 divisors (see below), whose sum is σ = 69425778240. Its totient is φ = 4882664448.

The previous prime is 20535222391. The next prime is 20535222443. The reversal of 20535222420 is 2422253502.

20535222420 is a `hidden beast` number, since 205 + 35 + 2 + 2 + 2 + 420 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118462 + ... + 234741.

It is an arithmetic number, because the mean of its divisors is an integer number (482123460).

Almost surely, 2^20535222420 is an apocalyptic number.

20535222420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535222420 is an abundant number, since it is smaller than the sum of its proper divisors (48890555820).

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

20535222420 is a wasteful number, since it uses less digits than its factorization.

20535222420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353254 (or 353249 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20535222420 its reverse (2422253502), we get a palindrome (22957475922).

The spelling of 20535222420 in words is "twenty billion, five hundred thirty-five million, two hundred twenty-two thousand, four hundred twenty".