20645350634 has 8 divisors (see below), whose sum is σ = 31242079620. Its totient is φ = 10231324096.

The previous prime is 20645350577. The next prime is 20645350637. The reversal of 20645350634 is 43605354602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12465052609 + 8180298025 = 111647^2 + 90445^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20645350637) 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, 45675329 + ... + 45675780.

Almost surely, 2^20645350634 is an apocalyptic number.

20645350634 is a deficient number, since it is larger than the sum of its proper divisors (10596728986).

20645350634 is a wasteful number, since it uses less digits than its factorization.

20645350634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91351224.

The product of its (nonzero) digits is 259200, while the sum is 38.

The spelling of 20645350634 in words is "twenty billion, six hundred forty-five million, three hundred fifty thousand, six hundred thirty-four".