20551433251436 has 24 divisors (see below), whose sum is σ = 36160754658336. Its totient is φ = 10219912663040.

The previous prime is 20551433251429. The next prime is 20551433251487. The reversal of 20551433251436 is 63415233415502.

It is a super-2 number, since 2×20551433251436² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14784395 + ... + 16114626.

It is an arithmetic number, because the mean of its divisors is an integer number (1506698110764).

Almost surely, 2^{20551433251436} is an apocalyptic number.

It is an amenable number.

20551433251436 is a deficient number, since it is larger than the sum of its proper divisors (15609321406900).

20551433251436 is a wasteful number, since it uses less digits than its factorization.

20551433251436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30899929 (or 30899927 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 44.

Adding to 20551433251436 its reverse (63415233415502), we get a palindrome (83966666666938).

The spelling of 20551433251436 in words is "twenty trillion, five hundred fifty-one billion, four hundred thirty-three million, two hundred fifty-one thousand, four hundred thirty-six".