20434310551 has 8 divisors (see below), whose sum is σ = 21707140400. Its totient is φ = 19181214720.

The previous prime is 20434310527. The next prime is 20434310563. The reversal of 20434310551 is 15501343402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434310551 is a prime.

It is a super-2 number, since 2×20434310551² (a number of 21 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 (20434310581) 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, 4931370 + ... + 4935511.

It is an arithmetic number, because the mean of its divisors is an integer number (2713392550).

Almost surely, 2^20434310551 is an apocalyptic number.

20434310551 is a deficient number, since it is larger than the sum of its proper divisors (1272829849).

20434310551 is a wasteful number, since it uses less digits than its factorization.

20434310551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9867009.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20434310551 its reverse (15501343402), we get a palindrome (35935653953).

The spelling of 20434310551 in words is "twenty billion, four hundred thirty-four million, three hundred ten thousand, five hundred fifty-one".