20515352530453 has 16 divisors (see below), whose sum is σ = 22392700646400. Its totient is φ = 18640058863680.

The previous prime is 20515352530423. The next prime is 20515352530481. The reversal of 20515352530453 is 35403525351502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20515352530453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515352530423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272580775 + ... + 272656027.

It is an arithmetic number, because the mean of its divisors is an integer number (1399543790400).

Almost surely, 2^{20515352530453} is an apocalyptic number.

It is an amenable number.

20515352530453 is a deficient number, since it is larger than the sum of its proper divisors (1877348115947).

20515352530453 is a wasteful number, since it uses less digits than its factorization.

20515352530453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88572.

The product of its (nonzero) digits is 1350000, while the sum is 43.

Adding to 20515352530453 its reverse (35403525351502), we get a palindrome (55918877881955).

The spelling of 20515352530453 in words is "twenty trillion, five hundred fifteen billion, three hundred fifty-two million, five hundred thirty thousand, four hundred fifty-three".