20921676 has 12 divisors (see below), whose sum is σ = 48817272. Its totient is φ = 6973888.

The previous prime is 20921657. The next prime is 20921689. The reversal of 20921676 is 67612902.

It is a tau number, because it is divible by the number of its divisors (12).

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, 871725 + ... + 871748.

It is an arithmetic number, because the mean of its divisors is an integer number (4068106).

Almost surely, 2^20921676 is an apocalyptic number.

It is an amenable number.

20921676 is an abundant number, since it is smaller than the sum of its proper divisors (27895596).

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

20921676 is a wasteful number, since it uses less digits than its factorization.

20921676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743480 (or 1743478 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20921676 is about 4574.0218626500. The cubic root of 20921676 is about 275.5489903579.

The spelling of 20921676 in words is "twenty million, nine hundred twenty-one thousand, six hundred seventy-six".