20506226512 has 10 divisors (see below), whose sum is σ = 39730813898. Its totient is φ = 10253113248.

The previous prime is 20506226497. The next prime is 20506226567. The reversal of 20506226512 is 21562260502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20505094416 + 1132096 = 143196^2 + 1064^2 .

It is a super-2 number, since 2×20506226512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640819563 + ... + 640819594.

Almost surely, 2^20506226512 is an apocalyptic number.

It is an amenable number.

20506226512 is a deficient number, since it is larger than the sum of its proper divisors (19224587386).

20506226512 is a wasteful number, since it uses less digits than its factorization.

20506226512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281639165 (or 1281639159 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 20506226512 in words is "twenty billion, five hundred six million, two hundred twenty-six thousand, five hundred twelve".