20645401442 has 16 divisors (see below), whose sum is σ = 31423583232. Its totient is φ = 10171052640.

The previous prime is 20645401433. The next prime is 20645401459. The reversal of 20645401442 is 24410454602.

It is a junction number, because it is equal to n+sod(n) for n = 20645401399 and 20645401408.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 191423 + ... + 279165.

It is an arithmetic number, because the mean of its divisors is an integer number (1963973952).

Almost surely, 2^20645401442 is an apocalyptic number.

20645401442 is a deficient number, since it is larger than the sum of its proper divisors (10778181790).

20645401442 is a wasteful number, since it uses less digits than its factorization.

20645401442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89473.

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 20645401442 in words is "twenty billion, six hundred forty-five million, four hundred one thousand, four hundred forty-two".