20798556 has 12 divisors (see below), whose sum is σ = 48529992. Its totient is φ = 6932848.

The previous prime is 20798549. The next prime is 20798573. The reversal of 20798556 is 65589702.

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

It is a congruent number.

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, 866595 + ... + 866618.

It is an arithmetic number, because the mean of its divisors is an integer number (4044166).

Almost surely, 2^20798556 is an apocalyptic number.

It is an amenable number.

20798556 is an abundant number, since it is smaller than the sum of its proper divisors (27731436).

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

20798556 is a wasteful number, since it uses less digits than its factorization.

20798556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733220 (or 1733218 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 20798556 is about 4560.5433886764. The cubic root of 20798556 is about 275.0074091668.

The spelling of 20798556 in words is "twenty million, seven hundred ninety-eight thousand, five hundred fifty-six".