20423355111 has 24 divisors (see below), whose sum is σ = 29597568000. Its totient is φ = 13570792272.

The previous prime is 20423355109. The next prime is 20423355167. The reversal of 20423355111 is 11155332402.

It is not a de Polignac number, because 20423355111 - 2¹ = 20423355109 is a prime.

It is a super-2 number, since 2×20423355111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423355811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5209410 + ... + 5213328.

It is an arithmetic number, because the mean of its divisors is an integer number (1233232000).

Almost surely, 2^20423355111 is an apocalyptic number.

20423355111 is a deficient number, since it is larger than the sum of its proper divisors (9174212889).

20423355111 is a wasteful number, since it uses less digits than its factorization.

20423355111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683 (or 5680 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 20423355111 its reverse (11155332402), we get a palindrome (31578687513).

The spelling of 20423355111 in words is "twenty billion, four hundred twenty-three million, three hundred fifty-five thousand, one hundred eleven".