20691010 has 8 divisors (see below), whose sum is σ = 37243836. Its totient is φ = 8276400.

The previous prime is 20691001. The next prime is 20691059. The reversal of 20691010 is 1019602.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 772641 = 4463^2 + 879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034541 + ... + 1034560.

Almost surely, 2^20691010 is an apocalyptic number.

20691010 is a deficient number, since it is larger than the sum of its proper divisors (16552826).

20691010 is a wasteful number, since it uses less digits than its factorization.

20691010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069108.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20691010 is about 4548.7371873961. The cubic root of 20691010 is about 274.5325833941.

The spelling of 20691010 in words is "twenty million, six hundred ninety-one thousand, ten".