20561419 has 8 divisors (see below), whose sum is σ = 21123648. Its totient is φ = 20004480.

The previous prime is 20561417. The next prime is 20561423. The reversal of 20561419 is 91416502.

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

It is a cyclic number.

It is not a de Polignac number, because 20561419 - 2¹ = 20561417 is a prime.

It is a super-2 number, since 2×20561419² = 845543902587122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20561413) 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, 7299 + ... + 9715.

It is an arithmetic number, because the mean of its divisors is an integer number (2640456).

Almost surely, 2^20561419 is an apocalyptic number.

20561419 is a deficient number, since it is larger than the sum of its proper divisors (562229).

20561419 is a wasteful number, since it uses less digits than its factorization.

20561419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20561419 is about 4534.4700903193. The cubic root of 20561419 is about 273.9582359490.

The spelling of 20561419 in words is "twenty million, five hundred sixty-one thousand, four hundred nineteen".