20863123240 has 16 divisors (see below), whose sum is σ = 46942027380. Its totient is φ = 8345249280.

The previous prime is 20863123187. The next prime is 20863123243. The reversal of 20863123240 is 4232136802.

It can be written as a sum of positive squares in 2 ways, for example, as 20737728036 + 125395204 = 144006^2 + 11198^2 .

It is a super-2 number, since 2×20863123240² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20863123243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260789001 + ... + 260789080.

Almost surely, 2^20863123240 is an apocalyptic number.

20863123240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20863123240 is an abundant number, since it is smaller than the sum of its proper divisors (26078904140).

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

20863123240 is a wasteful number, since it uses less digits than its factorization.

20863123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521578092 (or 521578088 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20863123240 in words is "twenty billion, eight hundred sixty-three million, one hundred twenty-three thousand, two hundred forty".