20403423321560 has 32 divisors (see below), whose sum is σ = 45913035772800. Its totient is φ = 8160421186560.

The previous prime is 20403423321559. The next prime is 20403423321571. The reversal of 20403423321560 is 6512332430402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20403423321560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29280776 + ... + 29969495.

It is an arithmetic number, because the mean of its divisors is an integer number (1434782367900).

Almost surely, 2^{20403423321560} is an apocalyptic number.

20403423321560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403423321560 is an abundant number, since it is smaller than the sum of its proper divisors (25509612451240).

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

20403423321560 is a wasteful number, since it uses less digits than its factorization.

20403423321560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59258891 (or 59258887 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 20403423321560 its reverse (6512332430402), we get a palindrome (26915755751962).

The spelling of 20403423321560 in words is "twenty trillion, four hundred three billion, four hundred twenty-three million, three hundred twenty-one thousand, five hundred sixty".