20511196 has 12 divisors (see below), whose sum is σ = 35960848. Its totient is φ = 10236672.

The previous prime is 20511157. The next prime is 20511217. The reversal of 20511196 is 69111502.

It is a super-2 number, since 2×20511196² = 841418322700832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20511196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136 + ... + 6751.

Almost surely, 2^20511196 is an apocalyptic number.

It is an amenable number.

20511196 is a deficient number, since it is larger than the sum of its proper divisors (15449652).

20511196 is a wasteful number, since it uses less digits than its factorization.

20511196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468 (or 9466 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 20511196 is about 4528.9287916681. The cubic root of 20511196 is about 273.7349987262.

Adding to 20511196 its reverse (69111502), we get a palindrome (89622698).

The spelling of 20511196 in words is "twenty million, five hundred eleven thousand, one hundred ninety-six".