20945419 has 4 divisors (see below), whose sum is σ = 22849560. Its totient is φ = 19041280.

The previous prime is 20945399. The next prime is 20945461. The reversal of 20945419 is 91454902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20945419 - 2⁷ = 20945291 is a prime.

It is a super-2 number, since 2×20945419² = 877421154171122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20945489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 952054 + ... + 952075.

It is an arithmetic number, because the mean of its divisors is an integer number (5712390).

Almost surely, 2^20945419 is an apocalyptic number.

20945419 is a deficient number, since it is larger than the sum of its proper divisors (1904141).

20945419 is a wasteful number, since it uses less digits than its factorization.

20945419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904140.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20945419 is about 4576.6165450035. The cubic root of 20945419 is about 275.6531867006.

It can be divided in two parts, 20945 and 419, that multiplied together give a triangular number (8775955 = T₄₁₈₉).

The spelling of 20945419 in words is "twenty million, nine hundred forty-five thousand, four hundred nineteen".