20520015012404 has 24 divisors (see below), whose sum is σ = 38044839554568. Its totient is φ = 9650773831680.

The previous prime is 20520015012397. The next prime is 20520015012407. The reversal of 20520015012404 is 40421051002502.

It can be written as a sum of positive squares in 4 ways, for example, as 8383514884900 + 12136500127504 = 2895430^2 + 3483748^2 .

It is a super-2 number, since 2×20520015012404² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520015012407) 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, 89006237 + ... + 89236484.

It is an arithmetic number, because the mean of its divisors is an integer number (1585201648107).

Almost surely, 2^{20520015012404} is an apocalyptic number.

It is an amenable number.

20520015012404 is a deficient number, since it is larger than the sum of its proper divisors (17524824542164).

20520015012404 is a wasteful number, since it uses less digits than its factorization.

20520015012404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178244435 (or 178244433 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20520015012404 its reverse (40421051002502), we get a palindrome (60941066014906).

The spelling of 20520015012404 in words is "twenty trillion, five hundred twenty billion, fifteen million, twelve thousand, four hundred four".