20423445212455 has 16 divisors (see below), whose sum is σ = 25530817593600. Its totient is φ = 15666638042880.

The previous prime is 20423445212449. The next prime is 20423445212483. The reversal of 20423445212455 is 55421254432402.

It is not a de Polignac number, because 20423445212455 - 2⁷ = 20423445212327 is a prime.

It is a super-2 number, since 2×20423445212455² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604405870 + ... + 604439659.

It is an arithmetic number, because the mean of its divisors is an integer number (1595676099600).

Almost surely, 2^{20423445212455} is an apocalyptic number.

20423445212455 is a deficient number, since it is larger than the sum of its proper divisors (5107372381145).

20423445212455 is a wasteful number, since it uses less digits than its factorization.

20423445212455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208845674.

The product of its (nonzero) digits is 1536000, while the sum is 43.

Adding to 20423445212455 its reverse (55421254432402), we get a palindrome (75844699644857).

The spelling of 20423445212455 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, two hundred twelve thousand, four hundred fifty-five".