20402632445 has 16 divisors (see below), whose sum is σ = 26378289840. Its totient is φ = 15059810304.

The previous prime is 20402632441. The next prime is 20402632447. The reversal of 20402632445 is 54423620402.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9331173604 + 11071458841 = 96598^2 + 105221^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402632445 - 2² = 20402632441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402632441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78317 + ... + 216653.

It is an arithmetic number, because the mean of its divisors is an integer number (1648643115).

Almost surely, 2^20402632445 is an apocalyptic number.

It is an amenable number.

20402632445 is a deficient number, since it is larger than the sum of its proper divisors (5975657395).

20402632445 is a wasteful number, since it uses less digits than its factorization.

20402632445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140624.

The product of its (nonzero) digits is 46080, while the sum is 32.

The spelling of 20402632445 in words is "twenty billion, four hundred two million, six hundred thirty-two thousand, four hundred forty-five".