20149973 has 2 divisors, whose sum is σ = 20149974. Its totient is φ = 20149972.

The previous prime is 20149967. The next prime is 20150021. The reversal of 20149973 is 37994102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 418609 = 4442^2 + 647^2 .

It is a cyclic number.

It is not a de Polignac number, because 20149973 - 2⁴ = 20149957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074986 + 10074987.

It is an arithmetic number, because the mean of its divisors is an integer number (10074987).

Almost surely, 2^20149973 is an apocalyptic number.

It is an amenable number.

20149973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149973 is an equidigital number, since it uses as much as digits as its factorization.

20149973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20149973 is about 4488.8721300567. The cubic root of 20149973 is about 272.1185550444.

The spelling of 20149973 in words is "twenty million, one hundred forty-nine thousand, nine hundred seventy-three".