20511351412 has 6 divisors (see below), whose sum is σ = 35894864978. Its totient is φ = 10255675704.

The previous prime is 20511351389. The next prime is 20511351463. The reversal of 20511351412 is 21415311502.

It can be written as a sum of positive squares in only one way, i.e., 18811768336 + 1699583076 = 137156^2 + 41226^2 .

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, 2563918923 + ... + 2563918930.

Almost surely, 2^20511351412 is an apocalyptic number.

It is an amenable number.

20511351412 is a deficient number, since it is larger than the sum of its proper divisors (15383513566).

20511351412 is a wasteful number, since it uses less digits than its factorization.

20511351412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127837857 (or 5127837855 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20511351412 its reverse (21415311502), we get a palindrome (41926662914).

The spelling of 20511351412 in words is "twenty billion, five hundred eleven million, three hundred fifty-one thousand, four hundred twelve".