20453025043642 has 4 divisors (see below), whose sum is σ = 30679537565466. Its totient is φ = 10226512521820.

The previous prime is 20453025043613. The next prime is 20453025043771. The reversal of 20453025043642 is 24634052035402.

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

It can be written as a sum of positive squares in only one way, i.e., 11598050059281 + 8854974984361 = 3405591^2 + 2975731^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20453025043595 and 20453025043604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5113256260909 + ... + 5113256260912.

Almost surely, 2^{20453025043642} is an apocalyptic number.

20453025043642 is a deficient number, since it is larger than the sum of its proper divisors (10226512521824).

20453025043642 is a wasteful number, since it uses less digits than its factorization.

20453025043642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10226512521823.

The product of its (nonzero) digits is 691200, while the sum is 40.

The spelling of 20453025043642 in words is "twenty trillion, four hundred fifty-three billion, twenty-five million, forty-three thousand, six hundred forty-two".