20423140560 has 60 divisors (see below), whose sum is σ = 68587716132. Its totient is φ = 5446170624.

The previous prime is 20423140523. The next prime is 20423140579. The reversal of 20423140560 is 6504132402.

20423140560 is a `hidden beast` number, since 20 + 4 + 231 + 405 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7804662336 + 12618478224 = 88344^2 + 112332^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×20423140560² (a number of 21 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 11 ways as a sum of consecutive naturals, for example, 14182017 + ... + 14183456.

Almost surely, 2^20423140560 is an apocalyptic number.

20423140560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423140560 is an abundant number, since it is smaller than the sum of its proper divisors (48164575572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423140560 is a wasteful number, since it uses less digits than its factorization.

20423140560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28365492 (or 28365483 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20423140560 its reverse (6504132402), we get a palindrome (26927272962).

The spelling of 20423140560 in words is "twenty billion, four hundred twenty-three million, one hundred forty thousand, five hundred sixty".