20531555770252 has 24 divisors (see below), whose sum is σ = 36342971542080. Its totient is φ = 10147907003520.

The previous prime is 20531555770247. The next prime is 20531555770261. The reversal of 20531555770252 is 25207755513502.

It is a junction number, because it is equal to n+sod(n) for n = 20531555770196 and 20531555770205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5739988 + ... + 8602939.

It is an arithmetic number, because the mean of its divisors is an integer number (1514290480920).

Almost surely, 2^{20531555770252} is an apocalyptic number.

It is an amenable number.

20531555770252 is a deficient number, since it is larger than the sum of its proper divisors (15811415771828).

20531555770252 is a wasteful number, since it uses less digits than its factorization.

20531555770252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14347041 (or 14347039 counting only the distinct ones).

The product of its (nonzero) digits is 3675000, while the sum is 49.

The spelling of 20531555770252 in words is "twenty trillion, five hundred thirty-one billion, five hundred fifty-five million, seven hundred seventy thousand, two hundred fifty-two".