20179421 has 8 divisors (see below), whose sum is σ = 20731704. Its totient is φ = 19630080.

The previous prime is 20179409. The next prime is 20179433. The reversal of 20179421 is 12497102.

It is an interprime number because it is at equal distance from previous prime (20179409) and next prime (20179433).

It can be written as a sum of positive squares in 4 ways, for example, as 722500 + 19456921 = 850^2 + 4411^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20179421 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 (20179021) 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, 23231 + ... + 24083.

It is an arithmetic number, because the mean of its divisors is an integer number (2591463).

Almost surely, 2^20179421 is an apocalyptic number.

It is an amenable number.

20179421 is a deficient number, since it is larger than the sum of its proper divisors (552283).

20179421 is an equidigital number, since it uses as much as digits as its factorization.

20179421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20179421 is about 4492.1510437651. The cubic root of 20179421 is about 272.2510522723.

The spelling of 20179421 in words is "twenty million, one hundred seventy-nine thousand, four hundred twenty-one".