20669340 has 48 divisors (see below), whose sum is σ = 60923520. Its totient is φ = 5221440.

The previous prime is 20669339. The next prime is 20669357. The reversal of 20669340 is 4396602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20669298 and 20669307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7926 + ... + 10205.

It is an arithmetic number, because the mean of its divisors is an integer number (1269240).

Almost surely, 2^20669340 is an apocalyptic number.

20669340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20669340 is an abundant number, since it is smaller than the sum of its proper divisors (40254180).

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

20669340 is a wasteful number, since it uses less digits than its factorization.

20669340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18162 (or 18160 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20669340 is about 4546.3545836197. The cubic root of 20669340 is about 274.4367092414.

The spelling of 20669340 in words is "twenty million, six hundred sixty-nine thousand, three hundred forty".