20355443550 has 72 divisors (see below), whose sum is σ = 58895100264. Its totient is φ = 5010569280.

The previous prime is 20355443519. The next prime is 20355443579. The reversal of 20355443550 is 5534455302.

20355443550 is a `hidden beast` number, since 2 + 0 + 35 + 544 + 35 + 50 = 666.

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 35 ways as a sum of consecutive naturals, for example, 1733932 + ... + 1745631.

Almost surely, 2^20355443550 is an apocalyptic number.

20355443550 is an abundant number, since it is smaller than the sum of its proper divisors (38539656714).

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

20355443550 is a wasteful number, since it uses less digits than its factorization.

20355443550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479594 (or 3479586 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 36.

Adding to 20355443550 its reverse (5534455302), we get a palindrome (25889898852).

The spelling of 20355443550 in words is "twenty billion, three hundred fifty-five million, four hundred forty-three thousand, five hundred fifty".