20427819 has 8 divisors (see below), whose sum is σ = 27258000. Its totient is φ = 13608096.

The previous prime is 20427817. The next prime is 20427821. The reversal of 20427819 is 91872402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20427817) and next prime (20427821).

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

It is not a de Polignac number, because 20427819 - 2¹ = 20427817 is a prime.

It is a super-2 number, since 2×20427819² = 834591578193522, 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 20427819.

It is not an unprimeable number, because it can be changed into a prime (20427817) 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, 6057 + ... + 8805.

It is an arithmetic number, because the mean of its divisors is an integer number (3407250).

Almost surely, 2^20427819 is an apocalyptic number.

20427819 is a deficient number, since it is larger than the sum of its proper divisors (6830181).

20427819 is a wasteful number, since it uses less digits than its factorization.

20427819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20427819 is about 4519.7144821327. The cubic root of 20427819 is about 273.3635885935.

The spelling of 20427819 in words is "twenty million, four hundred twenty-seven thousand, eight hundred nineteen".