20551433251453 has 8 divisors (see below), whose sum is σ = 22166840530296. Its totient is φ = 18940958515200.

The previous prime is 20551433251429. The next prime is 20551433251487. The reversal of 20551433251453 is 35415233415502.

It can be written as a sum of positive squares in 4 ways, for example, as 109125836964 + 20442307414489 = 330342^2 + 4521317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20551433251453 - 2⁹ = 20551433250941 is a prime.

It is a super-2 number, since 2×20551433251453² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551433254453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233126988 + ... + 1233143653.

It is an arithmetic number, because the mean of its divisors is an integer number (2770855066287).

Almost surely, 2^{20551433251453} is an apocalyptic number.

It is an amenable number.

20551433251453 is a deficient number, since it is larger than the sum of its proper divisors (1615407278843).

20551433251453 is a wasteful number, since it uses less digits than its factorization.

20551433251453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466271295.

The product of its (nonzero) digits is 1080000, while the sum is 43.

Adding to 20551433251453 its reverse (35415233415502), we get a palindrome (55966666666955).

The spelling of 20551433251453 in words is "twenty trillion, five hundred fifty-one billion, four hundred thirty-three million, two hundred fifty-one thousand, four hundred fifty-three".