20401339 has 4 divisors (see below), whose sum is σ = 23315824. Its totient is φ = 17486856.

The previous prime is 20401333. The next prime is 20401349. The reversal of 20401339 is 93310402.

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 20401339 - 2⁹ = 20400827 is a prime.

It is a super-4 number, since 4×20401339⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (20401333) 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, 1457232 + ... + 1457245.

It is an arithmetic number, because the mean of its divisors is an integer number (5828956).

Almost surely, 2^20401339 is an apocalyptic number.

20401339 is a deficient number, since it is larger than the sum of its proper divisors (2914485).

20401339 is an equidigital number, since it uses as much as digits as its factorization.

20401339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914484.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20401339 is about 4516.7841436137. The cubic root of 20401339 is about 273.2454197076.

The spelling of 20401339 in words is "twenty million, four hundred one thousand, three hundred thirty-nine".