20420869 has 8 divisors (see below), whose sum is σ = 23381120. Its totient is φ = 17471376.

The previous prime is 20420867. The next prime is 20420891. The reversal of 20420869 is 96802402.

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 20420869 - 2¹ = 20420867 is a prime.

It is a super-2 number, since 2×20420869² = 834023781430322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20420869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420861) 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, 1912 + ... + 6670.

It is an arithmetic number, because the mean of its divisors is an integer number (2922640).

Almost surely, 2^20420869 is an apocalyptic number.

It is an amenable number.

20420869 is a deficient number, since it is larger than the sum of its proper divisors (2960251).

20420869 is an equidigital number, since it uses as much as digits as its factorization.

20420869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20420869 is about 4518.9455628498. The cubic root of 20420869 is about 273.3325836122.

The spelling of 20420869 in words is "twenty million, four hundred twenty thousand, eight hundred sixty-nine".