20631266512 has 10 divisors (see below), whose sum is σ = 39973078898. Its totient is φ = 10315633248.

The previous prime is 20631266503. The next prime is 20631266519. The reversal of 20631266512 is 21566213602.

It can be written as a sum of positive squares in only one way, i.e., 15524163216 + 5107103296 = 124596^2 + 71464^2 .

It is a super-2 number, since 2×20631266512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631266519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644727063 + ... + 644727094.

Almost surely, 2^20631266512 is an apocalyptic number.

It is an amenable number.

20631266512 is a deficient number, since it is larger than the sum of its proper divisors (19341812386).

20631266512 is a wasteful number, since it uses less digits than its factorization.

20631266512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289454165 (or 1289454159 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 20631266512 in words is "twenty billion, six hundred thirty-one million, two hundred sixty-six thousand, five hundred twelve".