20918469 has 16 divisors (see below), whose sum is σ = 32768064. Its totient is φ = 11702400.

The previous prime is 20918467. The next prime is 20918479. The reversal of 20918469 is 96481902.

It is not a de Polignac number, because 20918469 - 2¹ = 20918467 is a prime.

It is a super-2 number, since 2×20918469² = 875164690607922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20918467) 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 15 ways as a sum of consecutive naturals, for example, 23952 + ... + 24809.

It is an arithmetic number, because the mean of its divisors is an integer number (2048004).

Almost surely, 2^20918469 is an apocalyptic number.

It is an amenable number.

20918469 is a deficient number, since it is larger than the sum of its proper divisors (11849595).

20918469 is a wasteful number, since it uses less digits than its factorization.

20918469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48788.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20918469 is about 4573.6712824601. The cubic root of 20918469 is about 275.5349103711.

The spelling of 20918469 in words is "twenty million, nine hundred eighteen thousand, four hundred sixty-nine".