20613421 has 8 divisors (see below), whose sum is σ = 21003840. Its totient is φ = 20225568.

The previous prime is 20613413. The next prime is 20613427. The reversal of 20613421 is 12431602.

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 20613421 - 2³ = 20613413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613427) 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, 23625 + ... + 24481.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480).

Almost surely, 2^20613421 is an apocalyptic number.

It is an amenable number.

20613421 is a deficient number, since it is larger than the sum of its proper divisors (390419).

20613421 is an equidigital number, since it uses as much as digits as its factorization.

20613421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20613421 is about 4540.2005462314. The cubic root of 20613421 is about 274.1889979542.

The spelling of 20613421 in words is "twenty million, six hundred thirteen thousand, four hundred twenty-one".