20401973 has 2 divisors, whose sum is σ = 20401974. Its totient is φ = 20401972.

The previous prime is 20401961. The next prime is 20402009. The reversal of 20401973 is 37910402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10804369 + 9597604 = 3287^2 + 3098^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401973 - 2⁴ = 20401957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200986 + 10200987.

It is an arithmetic number, because the mean of its divisors is an integer number (10200987).

Almost surely, 2^20401973 is an apocalyptic number.

It is an amenable number.

20401973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401973 is an equidigital number, since it uses as much as digits as its factorization.

20401973 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20401973 is about 4516.8543257449. The cubic root of 20401973 is about 273.2482501722.

The spelling of 20401973 in words is "twenty million, four hundred one thousand, nine hundred seventy-three".