20451442512 has 40 divisors (see below), whose sum is σ = 54537184000. Its totient is φ = 6597239040.

The previous prime is 20451442441. The next prime is 20451442523. The reversal of 20451442512 is 21524415402.

It is a self number, because there is not a number n which added to its sum of digits gives 20451442512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6870637 + ... + 6873612.

It is an arithmetic number, because the mean of its divisors is an integer number (1363429600).

Almost surely, 2^20451442512 is an apocalyptic number.

It is an amenable number.

20451442512 is an abundant number, since it is smaller than the sum of its proper divisors (34085741488).

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

20451442512 is a wasteful number, since it uses less digits than its factorization.

20451442512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744291 (or 13744285 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 20451442512 its reverse (21524415402), we get a palindrome (41975857914).

The spelling of 20451442512 in words is "twenty billion, four hundred fifty-one million, four hundred forty-two thousand, five hundred twelve".