20400263112540 has 48 divisors (see below), whose sum is σ = 57322576821888. Its totient is φ = 5420847296064.

The previous prime is 20400263112517. The next prime is 20400263112589. The reversal of 20400263112540 is 4521136200402.

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 = 20400263112498 and 20400263112507.

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, 600697482 + ... + 600731441.

It is an arithmetic number, because the mean of its divisors is an integer number (1194220350456).

Almost surely, 2^{20400263112540} is an apocalyptic number.

20400263112540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400263112540 is an abundant number, since it is smaller than the sum of its proper divisors (36922313709348).

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

20400263112540 is a wasteful number, since it uses less digits than its factorization.

20400263112540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201429218 (or 1201429216 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 20400263112540 its reverse (4521136200402), we get a palindrome (24921399312942).

The spelling of 20400263112540 in words is "twenty trillion, four hundred billion, two hundred sixty-three million, one hundred twelve thousand, five hundred forty".