20315503052461 has 4 divisors (see below), whose sum is σ = 20315545064892. Its totient is φ = 20315461040032.

The previous prime is 20315503052399. The next prime is 20315503052477. The reversal of 20315503052461 is 16425030551302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1681871796900 + 18633631255561 = 1296870^2 + 4316669^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315503052461 - 2¹³ = 20315503044269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315503052461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315503082461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20272330 + ... + 21250843.

It is an arithmetic number, because the mean of its divisors is an integer number (5078886266223).

Almost surely, 2^{20315503052461} is an apocalyptic number.

It is an amenable number.

20315503052461 is a deficient number, since it is larger than the sum of its proper divisors (42012431).

20315503052461 is an equidigital number, since it uses as much as digits as its factorization.

20315503052461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42012430.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20315503052461 in words is "twenty trillion, three hundred fifteen billion, five hundred three million, fifty-two thousand, four hundred sixty-one".