20434554451 has 2 divisors, whose sum is σ = 20434554452. Its totient is φ = 20434554450.

The previous prime is 20434554407. The next prime is 20434554457. The reversal of 20434554451 is 15445543402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434554451 - 2²⁵ = 20401000019 is a prime.

It is a super-2 number, since 2×20434554451² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20434554451.

It is not a weakly prime, because it can be changed into another prime (20434554457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217277225 + 10217277226.

It is an arithmetic number, because the mean of its divisors is an integer number (10217277226).

Almost surely, 2^20434554451 is an apocalyptic number.

20434554451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434554451 is an equidigital number, since it uses as much as digits as its factorization.

20434554451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192000, while the sum is 37.

The spelling of 20434554451 in words is "twenty billion, four hundred thirty-four million, five hundred fifty-four thousand, four hundred fifty-one".