20442354645 has 16 divisors (see below), whose sum is σ = 33762857472. Its totient is φ = 10550892480.

The previous prime is 20442354643. The next prime is 20442354659. The reversal of 20442354645 is 54645324402.

It is a happy number.

It is not a de Polignac number, because 20442354645 - 2¹ = 20442354643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442354643) 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, 21980562 + ... + 21981491.

It is an arithmetic number, because the mean of its divisors is an integer number (2110178592).

Almost surely, 2^20442354645 is an apocalyptic number.

It is an amenable number.

20442354645 is a deficient number, since it is larger than the sum of its proper divisors (13320502827).

20442354645 is a wasteful number, since it uses less digits than its factorization.

20442354645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43962092.

The product of its (nonzero) digits is 460800, while the sum is 39.

The spelling of 20442354645 in words is "twenty billion, four hundred forty-two million, three hundred fifty-four thousand, six hundred forty-five".