20669748 has 24 divisors (see below), whose sum is σ = 52614240. Its totient is φ = 6263520.

The previous prime is 20669729. The next prime is 20669767. The reversal of 20669748 is 84796602.

It is an interprime number because it is at equal distance from previous prime (20669729) and next prime (20669767).

It is a congruent number.

It is an unprimeable number.

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, 78163 + ... + 78426.

It is an arithmetic number, because the mean of its divisors is an integer number (2192260).

Almost surely, 2^20669748 is an apocalyptic number.

It is an amenable number.

20669748 is an abundant number, since it is smaller than the sum of its proper divisors (31944492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20669748 is a wasteful number, since it uses less digits than its factorization.

20669748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156607 (or 156605 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20669748 is about 4546.3994545134. The cubic root of 20669748 is about 274.4385149665.

The spelling of 20669748 in words is "twenty million, six hundred sixty-nine thousand, seven hundred forty-eight".