20418069 has 32 divisors (see below), whose sum is σ = 32219136. Its totient is φ = 11260800.

The previous prime is 20418031. The next prime is 20418121. The reversal of 20418069 is 96081402.

It is not a de Polignac number, because 20418069 - 2¹¹ = 20416021 is a prime.

It is a super-2 number, since 2×20418069² = 833795083377522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418169) 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 in 31 ways as a sum of consecutive naturals, for example, 135144 + ... + 135294.

It is an arithmetic number, because the mean of its divisors is an integer number (1006848).

Almost surely, 2^20418069 is an apocalyptic number.

It is an amenable number.

20418069 is a deficient number, since it is larger than the sum of its proper divisors (11801067).

20418069 is a wasteful number, since it uses less digits than its factorization.

20418069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20418069 is about 4518.6357454435. The cubic root of 20418069 is about 273.3200904087.

The spelling of 20418069 in words is "twenty million, four hundred eighteen thousand, sixty-nine".