20051252051664 has 80 divisors (see below), whose sum is σ = 53039350121472. Its totient is φ = 6523923364224.

The previous prime is 20051252051629. The next prime is 20051252051671. The reversal of 20051252051664 is 46615025215002.

It is a congruent number.

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, 197394 + ... + 6335729.

Almost surely, 2^{20051252051664} is an apocalyptic number.

20051252051664 is a gapful number since it is divisible by the number (24) 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 20051252051664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26519675060736).

20051252051664 is an abundant number, since it is smaller than the sum of its proper divisors (32988098069808).

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

20051252051664 is a wasteful number, since it uses less digits than its factorization.

20051252051664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534664 (or 6534658 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

Adding to 20051252051664 its reverse (46615025215002), we get a palindrome (66666277266666).

The spelling of 20051252051664 in words is "twenty trillion, fifty-one billion, two hundred fifty-two million, fifty-one thousand, six hundred sixty-four".