20415645442403 has 4 divisors (see below), whose sum is σ = 20552663197200. Its totient is φ = 20278627687608.

The previous prime is 20415645442399. The next prime is 20415645442417. The reversal of 20415645442403 is 30424454651402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20415645442403 - 2² = 20415645442399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415645942403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68508877175 + ... + 68508877472.

It is an arithmetic number, because the mean of its divisors is an integer number (5138165799300).

Almost surely, 2^{20415645442403} is an apocalyptic number.

20415645442403 is a deficient number, since it is larger than the sum of its proper divisors (137017754797).

20415645442403 is a wasteful number, since it uses less digits than its factorization.

20415645442403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137017754796.

The product of its (nonzero) digits is 1843200, while the sum is 44.

The spelling of 20415645442403 in words is "twenty trillion, four hundred fifteen billion, six hundred forty-five million, four hundred forty-two thousand, four hundred three".