20851419 has 16 divisors (see below), whose sum is σ = 28512000. Its totient is φ = 13549536.

The previous prime is 20851399. The next prime is 20851433. The reversal of 20851419 is 91415802.

It is a happy number.

It is not a de Polignac number, because 20851419 - 2⁷ = 20851291 is a prime.

It is a super-2 number, since 2×20851419² = 869563348627122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20853419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31312 + ... + 31970.

It is an arithmetic number, because the mean of its divisors is an integer number (1782000).

Almost surely, 2^20851419 is an apocalyptic number.

20851419 is a deficient number, since it is larger than the sum of its proper divisors (7660581).

20851419 is a wasteful number, since it uses less digits than its factorization.

20851419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20851419 is about 4566.3354016104. The cubic root of 20851419 is about 275.2402044524.

The spelling of 20851419 in words is "twenty million, eight hundred fifty-one thousand, four hundred nineteen".