20091010 has 16 divisors (see below), whose sum is σ = 36292536. Its totient is φ = 8007808.

The previous prime is 20090977. The next prime is 20091023. The reversal of 20091010 is 1019002.

It can be written as a sum of positive squares in 4 ways, for example, as 14814801 + 5276209 = 3849^2 + 2297^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499 + ... + 6358.

Almost surely, 2^20091010 is an apocalyptic number.

20091010 is a deficient number, since it is larger than the sum of its proper divisors (16201526).

20091010 is a wasteful number, since it uses less digits than its factorization.

20091010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 20091010 is about 4482.2996330009. The cubic root of 20091010 is about 271.8528706170.

The spelling of 20091010 in words is "twenty million, ninety-one thousand, ten".