20419999 has 8 divisors (see below), whose sum is σ = 21072960. Its totient is φ = 19777056.

The previous prime is 20419981. The next prime is 20420011. The reversal of 20419999 is 99991402.

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

It is not a de Polignac number, because 20419999 - 2⁷ = 20419871 is a prime.

It is a Duffinian number.

20419999 is a modest number, since divided by 9999 gives 2041 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20416999) 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, 1749 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (2634120).

Almost surely, 2^20419999 is an apocalyptic number.

20419999 is a deficient number, since it is larger than the sum of its proper divisors (652961).

20419999 is an equidigital number, since it uses as much as digits as its factorization.

20419999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 20419999 is about 4518.8493004304. The cubic root of 20419999 is about 273.3287019177.

It can be divided in two parts, 204 and 19999, that multiplied together give a triangular number (4079796 = T₂₈₅₆).

The spelling of 20419999 in words is "twenty million, four hundred nineteen thousand, nine hundred ninety-nine".