20617890423 has 8 divisors (see below), whose sum is σ = 29605176048. Its totient is φ = 12687932544.

The previous prime is 20617890407. The next prime is 20617890439. The reversal of 20617890423 is 32409871602.

It is an interprime number because it is at equal distance from previous prime (20617890407) and next prime (20617890439).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20617890423 - 2⁴ = 20617890407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617890443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264331890 + ... + 264331967.

It is an arithmetic number, because the mean of its divisors is an integer number (3700647006).

Almost surely, 2^20617890423 is an apocalyptic number.

20617890423 is a deficient number, since it is larger than the sum of its proper divisors (8987285625).

20617890423 is a wasteful number, since it uses less digits than its factorization.

20617890423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528663873.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 20617890423 in words is "twenty billion, six hundred seventeen million, eight hundred ninety thousand, four hundred twenty-three".