20439701 has 2 divisors, whose sum is σ = 20439702. Its totient is φ = 20439700.

The previous prime is 20439691. The next prime is 20439703. The reversal of 20439701 is 10793402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 5885476 = 3815^2 + 2426^2 .

It is a cyclic number.

It is not a de Polignac number, because 20439701 - 2¹⁸ = 20177557 is a prime.

Together with 20439703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20439703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219850 + 10219851.

It is an arithmetic number, because the mean of its divisors is an integer number (10219851).

Almost surely, 2^20439701 is an apocalyptic number.

It is an amenable number.

20439701 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439701 is an equidigital number, since it uses as much as digits as its factorization.

20439701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20439701 is about 4521.0287546088. The cubic root of 20439701 is about 273.4165796740.

The spelling of 20439701 in words is "twenty million, four hundred thirty-nine thousand, seven hundred one".