19790556 has 12 divisors (see below), whose sum is σ = 46177992. Its totient is φ = 6596848.

The previous prime is 19790543. The next prime is 19790569. The reversal of 19790556 is 65509791.

It is an interprime number because it is at equal distance from previous prime (19790543) and next prime (19790569).

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

It is a super-2 number, since 2×19790556² = 783332213578272, which contains 22 as substring.

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, 824595 + ... + 824618.

It is an arithmetic number, because the mean of its divisors is an integer number (3848166).

Almost surely, 2^19790556 is an apocalyptic number.

It is an amenable number.

19790556 is an abundant number, since it is smaller than the sum of its proper divisors (26387436).

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

19790556 is a wasteful number, since it uses less digits than its factorization.

19790556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649220 (or 1649218 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 19790556 is about 4448.6577751048. The cubic root of 19790556 is about 270.4909038981.

The spelling of 19790556 in words is "nineteen million, seven hundred ninety thousand, five hundred fifty-six".