20683969 has 8 divisors (see below), whose sum is σ = 21650112. Its totient is φ = 19723440.

The previous prime is 20683961. The next prime is 20683973. The reversal of 20683969 is 96938602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20683969 - 2³ = 20683961 is a prime.

It is a super-2 number, since 2×20683969² = 855653147185922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20683961) 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 7 ways as a sum of consecutive naturals, for example, 7374 + ... + 9784.

It is an arithmetic number, because the mean of its divisors is an integer number (2706264).

Almost surely, 2^20683969 is an apocalyptic number.

It is an amenable number.

20683969 is a deficient number, since it is larger than the sum of its proper divisors (966143).

20683969 is a wasteful number, since it uses less digits than its factorization.

20683969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20683969 is about 4547.9631704753. The cubic root of 20683969 is about 274.5014393816.

The spelling of 20683969 in words is "twenty million, six hundred eighty-three thousand, nine hundred sixty-nine".