20990069 has 8 divisors (see below), whose sum is σ = 21776640. Its totient is φ = 20210400.

The previous prime is 20990033. The next prime is 20990071. The reversal of 20990069 is 96009902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20990069 is a prime.

It is a super-2 number, since 2×20990069² = 881165993249522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4937 + ... + 8145.

It is an arithmetic number, because the mean of its divisors is an integer number (2722080).

Almost surely, 2^20990069 is an apocalyptic number.

It is an amenable number.

20990069 is a deficient number, since it is larger than the sum of its proper divisors (786571).

20990069 is a wasteful number, since it uses less digits than its factorization.

20990069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3451.

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

The square root of 20990069 is about 4581.4920058863. The cubic root of 20990069 is about 275.8489205014.

The spelling of 20990069 in words is "twenty million, nine hundred ninety thousand, sixty-nine".