19901010 has 32 divisors (see below), whose sum is σ = 48480192. Its totient is φ = 5227200.

The previous prime is 19900997. The next prime is 19901029. The reversal of 19901010 is 1010991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (1515006).

Almost surely, 2^19901010 is an apocalyptic number.

19901010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19901010 is an abundant number, since it is smaller than the sum of its proper divisors (28579182).

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

19901010 is a wasteful number, since it uses less digits than its factorization.

19901010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 19901010 is about 4461.0548080023. The cubic root of 19901010 is about 270.9931871038.

The spelling of 19901010 in words is "nineteen million, nine hundred one thousand, ten".