19536990 has 64 divisors (see below), whose sum is σ = 51916032. Its totient is φ = 4665600.

The previous prime is 19536989. The next prime is 19536991. The reversal of 19536990 is 9963591.

It is an interprime number because it is at equal distance from previous prime (19536989) and next prime (19536991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19536991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23685 + ... + 24495.

It is an arithmetic number, because the mean of its divisors is an integer number (811188).

Almost surely, 2^19536990 is an apocalyptic number.

19536990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19536990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25958016).

19536990 is an abundant number, since it is smaller than the sum of its proper divisors (32379042).

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

19536990 is a wasteful number, since it uses less digits than its factorization.

19536990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 19536990 is about 4420.0667415776. The cubic root of 19536990 is about 269.3307154409.

The spelling of 19536990 in words is "nineteen million, five hundred thirty-six thousand, nine hundred ninety".