20099690 has 16 divisors (see below), whose sum is σ = 38962728. Its totient is φ = 7421376.

The previous prime is 20099689. The next prime is 20099719. The reversal of 20099690 is 9699002.

It can be written as a sum of positive squares in 4 ways, for example, as 7447441 + 12652249 = 2729^2 + 3557^2 .

It is a super-2 number, since 2×20099690² = 807995076192200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20099690.

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, 77177 + ... + 77436.

Almost surely, 2^20099690 is an apocalyptic number.

20099690 is a deficient number, since it is larger than the sum of its proper divisors (18863038).

20099690 is a wasteful number, since it uses less digits than its factorization.

20099690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154633.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 20099690 is about 4483.2677814291. The cubic root of 20099690 is about 271.8920148773.

The spelling of 20099690 in words is "twenty million, ninety-nine thousand, six hundred ninety".