19947090 has 32 divisors (see below), whose sum is σ = 47998656. Its totient is φ = 5305280.

The previous prime is 19947089. The next prime is 19947101. The reversal of 19947090 is 9074991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16300 + ... + 17480.

It is an arithmetic number, because the mean of its divisors is an integer number (1499958).

Almost surely, 2^19947090 is an apocalyptic number.

19947090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19947090 is an abundant number, since it is smaller than the sum of its proper divisors (28051566).

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

19947090 is a wasteful number, since it uses less digits than its factorization.

19947090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 19947090 is about 4466.2165196058. The cubic root of 19947090 is about 271.2021838740.

The spelling of 19947090 in words is "nineteen million, nine hundred forty-seven thousand, ninety".