20551242510000 has 400 divisors, whose sum is σ = 74723346749920. Its totient is φ = 5405253120000.

The previous prime is 20551242509971. The next prime is 20551242510031. The reversal of 20551242510000 is 1524215502.

20551242510000 is a `hidden beast` number, since 2 + 0 + 5 + 512 + 42 + 5 + 100 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (400).

It is a super-2 number, since 2×20551242510000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19188660 + ... + 20231340.

Almost surely, 2^{20551242510000} is an apocalyptic number.

20551242510000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20551242510000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37361673374960).

20551242510000 is an abundant number, since it is smaller than the sum of its proper divisors (54172104239920).

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

20551242510000 is a wasteful number, since it uses less digits than its factorization.

20551242510000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042791 (or 1042764 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 20551242510000 its reverse (1524215502), we get a palindrome (20552766725502).

The spelling of 20551242510000 in words is "twenty trillion, five hundred fifty-one billion, two hundred forty-two million, five hundred ten thousand".