20723401 has 2 divisors, whose sum is σ = 20723402. Its totient is φ = 20723400.

The previous prime is 20723399. The next prime is 20723411. The reversal of 20723401 is 10432702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 7590025 = 3624^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 20723401 - 2¹ = 20723399 is a prime.

Together with 20723399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20723411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361700 + 10361701.

It is an arithmetic number, because the mean of its divisors is an integer number (10361701).

Almost surely, 2^20723401 is an apocalyptic number.

It is an amenable number.

20723401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723401 is an equidigital number, since it uses as much as digits as its factorization.

20723401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20723401 is about 4552.2962337704. The cubic root of 20723401 is about 274.6757655250.

The spelling of 20723401 in words is "twenty million, seven hundred twenty-three thousand, four hundred one".