20206836 has 36 divisors (see below), whose sum is σ = 55008772. Its totient is φ = 6217344.

The previous prime is 20206819. The next prime is 20206853. The reversal of 20206836 is 63860202.

It is an interprime number because it is at equal distance from previous prime (20206819) and next prime (20206853).

It can be written as a sum of positive squares in 2 ways, for example, as 7290000 + 12916836 = 2700^2 + 3594^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20206836² = 816632442261792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21121 + ... + 22056.

Almost surely, 2^20206836 is an apocalyptic number.

20206836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20206836 is an abundant number, since it is smaller than the sum of its proper divisors (34801936).

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

20206836 is a wasteful number, since it uses less digits than its factorization.

20206836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43200 (or 43195 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20206836 is about 4495.2014415374. The cubic root of 20206836 is about 272.3742864846.

The spelling of 20206836 in words is "twenty million, two hundred six thousand, eight hundred thirty-six".