20994836 has 24 divisors (see below), whose sum is σ = 38623200. Its totient is φ = 9973152.

The previous prime is 20994821. The next prime is 20994851. The reversal of 20994836 is 63849902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20994821) and next prime (20994851).

It is a junction number, because it is equal to n+sod(n) for n = 20994793 and 20994802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4715 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (1609300).

Almost surely, 2^20994836 is an apocalyptic number.

It is an amenable number.

20994836 is a deficient number, since it is larger than the sum of its proper divisors (17628364).

20994836 is a wasteful number, since it uses less digits than its factorization.

20994836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383 (or 3381 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20994836 is about 4582.0122217209. The cubic root of 20994836 is about 275.8698013644.

The spelling of 20994836 in words is "twenty million, nine hundred ninety-four thousand, eight hundred thirty-six".