20485739 has 2 divisors, whose sum is σ = 20485740. Its totient is φ = 20485738.

The previous prime is 20485733. The next prime is 20485757. The reversal of 20485739 is 93758402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20485739 - 2⁸ = 20485483 is a prime.

It is a super-2 number, since 2×20485739² = 839331004752242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20485733) 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, 10242869 + 10242870.

It is an arithmetic number, because the mean of its divisors is an integer number (10242870).

Almost surely, 2^20485739 is an apocalyptic number.

20485739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20485739 is an equidigital number, since it uses as much as digits as its factorization.

20485739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20485739 is about 4526.1174310882. The cubic root of 20485739 is about 273.6217052064.

The spelling of 20485739 in words is "twenty million, four hundred eighty-five thousand, seven hundred thirty-nine".