20251453520 has 20 divisors (see below), whose sum is σ = 47084629620. Its totient is φ = 8100581376.

The previous prime is 20251453489. The next prime is 20251453543. The reversal of 20251453520 is 2535415202.

It can be written as a sum of positive squares in 2 ways, for example, as 3902251024 + 16349202496 = 62468^2 + 127864^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126571505 + ... + 126571664.

It is an arithmetic number, because the mean of its divisors is an integer number (2354231481).

Almost surely, 2^20251453520 is an apocalyptic number.

20251453520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251453520 is an abundant number, since it is smaller than the sum of its proper divisors (26833176100).

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

20251453520 is a wasteful number, since it uses less digits than its factorization.

20251453520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253143182 (or 253143176 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 20251453520 its reverse (2535415202), we get a palindrome (22786868722).

The spelling of 20251453520 in words is "twenty billion, two hundred fifty-one million, four hundred fifty-three thousand, five hundred twenty".