20051252051620 has 24 divisors (see below), whose sum is σ = 42107715236664. Its totient is φ = 8020484453376.

The previous prime is 20051252051569. The next prime is 20051252051629. The reversal of 20051252051620 is 2615025215002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 121241847204 + 19930010204416 = 348198^2 + 4464304^2 .

It is not an unprimeable number, because it can be changed into a prime (20051252051629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15653652 + ... + 16886068.

It is an arithmetic number, because the mean of its divisors is an integer number (1754488134861).

Almost surely, 2^{20051252051620} is an apocalyptic number.

20051252051620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20051252051620 is an abundant number, since it is smaller than the sum of its proper divisors (22056463185044).

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

20051252051620 is a wasteful number, since it uses less digits than its factorization.

20051252051620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045919 (or 2045917 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 20051252051620 its reverse (2615025215002), we get a palindrome (22666277266622).

The spelling of 20051252051620 in words is "twenty trillion, fifty-one billion, two hundred fifty-two million, fifty-one thousand, six hundred twenty".