20645401443 has 16 divisors (see below), whose sum is σ = 29149362720. Its totient is φ = 12952682496.

The previous prime is 20645401433. The next prime is 20645401459. The reversal of 20645401443 is 34410454602.

It is a happy number.

It is not a de Polignac number, because 20645401443 - 2⁶ = 20645401379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20645401433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911763 + ... + 934131.

It is an arithmetic number, because the mean of its divisors is an integer number (1821835170).

Almost surely, 2^20645401443 is an apocalyptic number.

20645401443 is a deficient number, since it is larger than the sum of its proper divisors (8503961277).

20645401443 is a wasteful number, since it uses less digits than its factorization.

20645401443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40486.

The product of its (nonzero) digits is 46080, while the sum is 33.

The spelling of 20645401443 in words is "twenty billion, six hundred forty-five million, four hundred one thousand, four hundred forty-three".