20641379 has 8 divisors (see below), whose sum is σ = 22683888. Its totient is φ = 18626560.

The previous prime is 20641351. The next prime is 20641393. The reversal of 20641379 is 97314602.

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 20641379 - 2⁸ = 20641123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641339) 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, 5342 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (2835486).

Almost surely, 2^20641379 is an apocalyptic number.

20641379 is a deficient number, since it is larger than the sum of its proper divisors (2042509).

20641379 is a wasteful number, since it uses less digits than its factorization.

20641379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13845.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20641379 is about 4543.2784418303. The cubic root of 20641379 is about 274.3129028754.

It can be divided in two parts, 2064 and 1379, that added together give a palindrome (3443).

The spelling of 20641379 in words is "twenty million, six hundred forty-one thousand, three hundred seventy-nine".