20675420071 has 4 divisors (see below), whose sum is σ = 20676760432. Its totient is φ = 20674079712.

The previous prime is 20675420063. The next prime is 20675420081. The reversal of 20675420071 is 17002457602.

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 20675420071 - 2³ = 20675420063 is a prime.

It is a super-2 number, since 2×20675420071² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675420081) 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, 646770 + ... + 677983.

It is an arithmetic number, because the mean of its divisors is an integer number (5169190108).

Almost surely, 2^20675420071 is an apocalyptic number.

20675420071 is a deficient number, since it is larger than the sum of its proper divisors (1340361).

20675420071 is a wasteful number, since it uses less digits than its factorization.

20675420071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340360.

The product of its (nonzero) digits is 23520, while the sum is 34.

Adding to 20675420071 its reverse (17002457602), we get a palindrome (37677877673).

The spelling of 20675420071 in words is "twenty billion, six hundred seventy-five million, four hundred twenty thousand, seventy-one".