20746940 has 12 divisors (see below), whose sum is σ = 43568616. Its totient is φ = 8298768.

The previous prime is 20746939. The next prime is 20746961. The reversal of 20746940 is 4964702.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20746897 and 20746906.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 518654 + ... + 518693.

It is an arithmetic number, because the mean of its divisors is an integer number (3630718).

Almost surely, 2^20746940 is an apocalyptic number.

20746940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20746940 is an abundant number, since it is smaller than the sum of its proper divisors (22821676).

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

20746940 is a wasteful number, since it uses less digits than its factorization.

20746940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037356 (or 1037354 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20746940 is about 4554.8808985527. The cubic root of 20746940 is about 274.7797244324.

The spelling of 20746940 in words is "twenty million, seven hundred forty-six thousand, nine hundred forty".