20155419 has 8 divisors (see below), whose sum is σ = 29859920. Its totient is φ = 13436928.

The previous prime is 20155411. The next prime is 20155427. The reversal of 20155419 is 91455102.

It is an interprime number because it is at equal distance from previous prime (20155411) and next prime (20155427).

It is not a de Polignac number, because 20155419 - 2³ = 20155411 is a prime.

It is a super-2 number, since 2×20155419² = 812481830131122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 746497 = 20155419 / (2 + 0 + 1 + 5 + 5 + 4 + 1 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20155392 and 20155401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155411) 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, 373222 + ... + 373275.

It is an arithmetic number, because the mean of its divisors is an integer number (3732490).

Almost surely, 2^20155419 is an apocalyptic number.

20155419 is a deficient number, since it is larger than the sum of its proper divisors (9704501).

20155419 is an equidigital number, since it uses as much as digits as its factorization.

20155419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746506 (or 746500 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 20155419 is about 4489.4787002502. The cubic root of 20155419 is about 272.1430682974.

The spelling of 20155419 in words is "twenty million, one hundred fifty-five thousand, four hundred nineteen".