20401550251250 has 160 divisors (see below), whose sum is σ = 46305999336960. Its totient is φ = 6578864640000.

The previous prime is 20401550251217. The next prime is 20401550251283. The reversal of 20401550251250 is 5215205510402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20401550251217) and next prime (20401550251283).

It is a Curzon number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 221442695 + ... + 221534805.

It is an arithmetic number, because the mean of its divisors is an integer number (289412495856).

Almost surely, 2^{20401550251250} is an apocalyptic number.

20401550251250 is an abundant number, since it is smaller than the sum of its proper divisors (25904449085710).

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

20401550251250 is a wasteful number, since it uses less digits than its factorization.

20401550251250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93646 (or 93631 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 32.

Adding to 20401550251250 its reverse (5215205510402), we get a palindrome (25616755761652).

The spelling of 20401550251250 in words is "twenty trillion, four hundred one billion, five hundred fifty million, two hundred fifty-one thousand, two hundred fifty".