20405220102534 has 16 divisors (see below), whose sum is σ = 41580448511472. Its totient is φ = 6673405316448.

The previous prime is 20405220102529. The next prime is 20405220102539. The reversal of 20405220102534 is 43520102250402.

It is an interprime number because it is at equal distance from previous prime (20405220102529) and next prime (20405220102539).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405220102539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32083679089 + ... + 32083679724.

It is an arithmetic number, because the mean of its divisors is an integer number (2598778031967).

Almost surely, 2^{20405220102534} is an apocalyptic number.

20405220102534 is an abundant number, since it is smaller than the sum of its proper divisors (21175228408938).

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

20405220102534 is a wasteful number, since it uses less digits than its factorization.

20405220102534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64167358871.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20405220102534 its reverse (43520102250402), we get a palindrome (63925322352936).

The spelling of 20405220102534 in words is "twenty trillion, four hundred five billion, two hundred twenty million, one hundred two thousand, five hundred thirty-four".