20853000040 has 16 divisors (see below), whose sum is σ = 46919250180. Its totient is φ = 8341200000.

The previous prime is 20853000001. The next prime is 20853000059. The reversal of 20853000040 is 4000035802.

It can be written as a sum of positive squares in 2 ways, for example, as 20158888324 + 694111716 = 141982^2 + 26346^2 .

It is a super-2 number, since 2×20853000040² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20852999975 and 20853000020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260662461 + ... + 260662540.

Almost surely, 2^20853000040 is an apocalyptic number.

20853000040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20853000040 is an abundant number, since it is smaller than the sum of its proper divisors (26066250140).

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

20853000040 is a wasteful number, since it uses less digits than its factorization.

20853000040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521325012 (or 521325008 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20853000040 its reverse (4000035802), we get a palindrome (24853035842).

The spelling of 20853000040 in words is "twenty billion, eight hundred fifty-three million, forty", and thus it is an aban number.