20434655744651 has 4 divisors (see below), whose sum is σ = 20443392239400. Its totient is φ = 20425919249904.

The previous prime is 20434655744567. The next prime is 20434655744669. The reversal of 20434655744651 is 15644755643402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434655744651 is a prime.

It is a super-2 number, since 2×20434655744651² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434655744351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4368243866 + ... + 4368248543.

It is an arithmetic number, because the mean of its divisors is an integer number (5110848059850).

Almost surely, 2^{20434655744651} is an apocalyptic number.

20434655744651 is a deficient number, since it is larger than the sum of its proper divisors (8736494749).

20434655744651 is an equidigital number, since it uses as much as digits as its factorization.

20434655744651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8736494748.

The product of its (nonzero) digits is 48384000, while the sum is 56.

The spelling of 20434655744651 in words is "twenty trillion, four hundred thirty-four billion, six hundred fifty-five million, seven hundred forty-four thousand, six hundred fifty-one".