20520403444250 has 32 divisors (see below), whose sum is σ = 39307548646080. Its totient is φ = 8017273899600.

The previous prime is 20520403444249. The next prime is 20520403444267. The reversal of 20520403444250 is 5244430402502.

It is a self number, because there is not a number n which added to its sum of digits gives 20520403444250.

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, 954426620 + ... + 954448119.

It is an arithmetic number, because the mean of its divisors is an integer number (1228360895190).

Almost surely, 2^{20520403444250} is an apocalyptic number.

20520403444250 is a deficient number, since it is larger than the sum of its proper divisors (18787145201830).

20520403444250 is a wasteful number, since it uses less digits than its factorization.

20520403444250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908874799 (or 1908874789 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 35.

Adding to 20520403444250 its reverse (5244430402502), we get a palindrome (25764833846752).

The spelling of 20520403444250 in words is "twenty trillion, five hundred twenty billion, four hundred three million, four hundred forty-four thousand, two hundred fifty".