19980090 has 48 divisors (see below), whose sum is σ = 55947528. Its totient is φ = 4917888.

The previous prime is 19980073. The next prime is 19980091. The reversal of 19980090 is 9008991.

It can be written as a sum of positive squares in 4 ways, for example, as 11840481 + 8139609 = 3441^2 + 2853^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19980091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7369 + ... + 9708.

Almost surely, 2^19980090 is an apocalyptic number.

19980090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19980090 is an abundant number, since it is smaller than the sum of its proper divisors (35967438).

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

19980090 is a wasteful number, since it uses less digits than its factorization.

19980090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17103 (or 17100 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 19980090 is about 4469.9093950549. The cubic root of 19980090 is about 271.3516583290.

The spelling of 19980090 in words is "nineteen million, nine hundred eighty thousand, ninety".