20210869 has 8 divisors (see below), whose sum is σ = 23125760. Its totient is φ = 17302896.

The previous prime is 20210867. The next prime is 20210881. The reversal of 20210869 is 96801202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20210869 - 2¹ = 20210867 is a prime.

It is a super-2 number, since 2×20210869² = 816958451470322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210867) 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, 8947 + ... + 10975.

It is an arithmetic number, because the mean of its divisors is an integer number (2890720).

Almost surely, 2^20210869 is an apocalyptic number.

It is an amenable number.

20210869 is a deficient number, since it is larger than the sum of its proper divisors (2914891).

20210869 is a wasteful number, since it uses less digits than its factorization.

20210869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20210869 is about 4495.6500086194. The cubic root of 20210869 is about 272.3924059702.

The spelling of 20210869 in words is "twenty million, two hundred ten thousand, eight hundred sixty-nine".