20002690 has 8 divisors (see below), whose sum is σ = 36004860. Its totient is φ = 8001072.

The previous prime is 20002679. The next prime is 20002691. The reversal of 20002690 is 9620002.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 844561 = 4377^2 + 919^2 .

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

It is a super-2 number, since 2×20002690² = 800215214472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20002691) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1000125 + ... + 1000144.

Almost surely, 2^20002690 is an apocalyptic number.

20002690 is a deficient number, since it is larger than the sum of its proper divisors (16002170).

20002690 is a wasteful number, since it uses less digits than its factorization.

20002690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000276.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20002690 is about 4472.4366960305. The cubic root of 20002690 is about 271.4539307529.

Adding to 20002690 its reverse (9620002), we get a palindrome (29622692).

The spelling of 20002690 in words is "twenty million, two thousand, six hundred ninety".