20423255123405 has 8 divisors (see below), whose sum is σ = 24508117231584. Its totient is φ = 16338463376400.

The previous prime is 20423255123291. The next prime is 20423255123413. The reversal of 20423255123405 is 50432155232402.

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

It is not a de Polignac number, because 20423255123405 - 2²⁸ = 20422986687949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16949591 + ... + 18114500.

It is an arithmetic number, because the mean of its divisors is an integer number (3063514653948).

Almost surely, 2^{20423255123405} is an apocalyptic number.

It is an amenable number.

20423255123405 is a deficient number, since it is larger than the sum of its proper divisors (4084862108179).

20423255123405 is a wasteful number, since it uses less digits than its factorization.

20423255123405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35180587.

The product of its (nonzero) digits is 288000, while the sum is 38.

The spelling of 20423255123405 in words is "twenty trillion, four hundred twenty-three billion, two hundred fifty-five million, one hundred twenty-three thousand, four hundred five".