20535312540 has 48 divisors (see below), whose sum is σ = 57507932160. Its totient is φ = 5475220800.

The previous prime is 20535312527. The next prime is 20535312557. The reversal of 20535312540 is 4521353502.

It is a super-2 number, since 2×20535312540² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20535312498 and 20535312507.

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, 417781 + ... + 464339.

It is an arithmetic number, because the mean of its divisors is an integer number (1198081920).

Almost surely, 2^20535312540 is an apocalyptic number.

20535312540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535312540 is an abundant number, since it is smaller than the sum of its proper divisors (36972619620).

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

20535312540 is a wasteful number, since it uses less digits than its factorization.

20535312540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53922 (or 53920 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 20535312540 in words is "twenty billion, five hundred thirty-five million, three hundred twelve thousand, five hundred forty".