20551012 has 12 divisors (see below), whose sum is σ = 36022140. Its totient is φ = 10258976.

The previous prime is 20551007. The next prime is 20551019. The reversal of 20551012 is 21015502.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 9897316 = 3264^2 + 3146^2 .

It is not an unprimeable number, because it can be changed into a prime (20551019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087 + ... + 6502.

It is an arithmetic number, because the mean of its divisors is an integer number (3001845).

Almost surely, 2^20551012 is an apocalyptic number.

It is an amenable number.

20551012 is a deficient number, since it is larger than the sum of its proper divisors (15471128).

20551012 is a wasteful number, since it uses less digits than its factorization.

20551012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8270 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20551012 is about 4533.3224019476. The cubic root of 20551012 is about 273.9120075488.

Adding to 20551012 its reverse (21015502), we get a palindrome (41566514).

The spelling of 20551012 in words is "twenty million, five hundred fifty-one thousand, twelve".