20736842 has 16 divisors (see below), whose sum is σ = 35629632. Its totient is φ = 8867040.

The previous prime is 20736791. The next prime is 20736853. The reversal of 20736842 is 24863702.

It is a super-2 number, since 2×20736842² = 860033232265928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20736799 and 20736808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5873 + ... + 8715.

It is an arithmetic number, because the mean of its divisors is an integer number (2226852).

Almost surely, 2^20736842 is an apocalyptic number.

20736842 is a deficient number, since it is larger than the sum of its proper divisors (14892790).

20736842 is a wasteful number, since it uses less digits than its factorization.

20736842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20736842 is about 4553.7722824050. The cubic root of 20736842 is about 274.7351367172.

The spelling of 20736842 in words is "twenty million, seven hundred thirty-six thousand, eight hundred forty-two".