20645000326 has 16 divisors (see below), whose sum is σ = 31283831664. Its totient is φ = 10217582944.

The previous prime is 20645000291. The next prime is 20645000329. The reversal of 20645000326 is 62300054602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20645000294 and 20645000303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645000329) 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, 52885 + ... + 209968.

It is an arithmetic number, because the mean of its divisors is an integer number (1955239479).

Almost surely, 2^20645000326 is an apocalyptic number.

20645000326 is a deficient number, since it is larger than the sum of its proper divisors (10638831338).

20645000326 is a wasteful number, since it uses less digits than its factorization.

20645000326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263255.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 20645000326 its reverse (62300054602), we get a palindrome (82945054928).

The spelling of 20645000326 in words is "twenty billion, six hundred forty-five million, three hundred twenty-six", and thus it is an aban number.