20402419 has 2 divisors, whose sum is σ = 20402420. Its totient is φ = 20402418.

The previous prime is 20402411. The next prime is 20402441. The reversal of 20402419 is 91420402.

It is an a-pointer prime, because the next prime (20402441) can be obtained adding 20402419 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20402419 - 2³ = 20402411 is a prime.

It is a super-2 number, since 2×20402419² = 832517402103122, 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 20402419.

It is not a weakly prime, because it can be changed into another prime (20402411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201209 + 10201210.

It is an arithmetic number, because the mean of its divisors is an integer number (10201210).

Almost surely, 2^20402419 is an apocalyptic number.

20402419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402419 is an equidigital number, since it uses as much as digits as its factorization.

20402419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20402419 is about 4516.9036961175. The cubic root of 20402419 is about 273.2502412840.

The spelling of 20402419 in words is "twenty million, four hundred two thousand, four hundred nineteen".