20434716545 has 8 divisors (see below), whose sum is σ = 24584699880. Its totient is φ = 16305746560.

The previous prime is 20434716529. The next prime is 20434716559. The reversal of 20434716545 is 54561743402.

It can be written as a sum of positive squares in 4 ways, for example, as 3482416144 + 16952300401 = 59012^2 + 130201^2 .

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

It is not a de Polignac number, because 20434716545 - 2⁴ = 20434716529 is a prime.

It is a Curzon number.

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, 5251196 + ... + 5255085.

It is an arithmetic number, because the mean of its divisors is an integer number (3073087485).

Almost surely, 2^20434716545 is an apocalyptic number.

It is an amenable number.

20434716545 is a deficient number, since it is larger than the sum of its proper divisors (4149983335).

20434716545 is a wasteful number, since it uses less digits than its factorization.

20434716545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506675.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20434716545 in words is "twenty billion, four hundred thirty-four million, seven hundred sixteen thousand, five hundred forty-five".