20551212 has 48 divisors (see below), whose sum is σ = 58128000. Its totient is φ = 6227280.

The previous prime is 20551207. The next prime is 20551229. The reversal of 20551212 is 21215502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7462 + ... + 9837.

It is an arithmetic number, because the mean of its divisors is an integer number (1211000).

Almost surely, 2^20551212 is an apocalyptic number.

20551212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20551212 is an abundant number, since it is smaller than the sum of its proper divisors (37576788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20551212 is a wasteful number, since it uses less digits than its factorization.

20551212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17323 (or 17315 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20551212 is about 4533.3444607707. The cubic root of 20551212 is about 273.9128961056.

Adding to 20551212 its reverse (21215502), we get a palindrome (41766714).

The spelling of 20551212 in words is "twenty million, five hundred fifty-one thousand, two hundred twelve".