20669730 has 32 divisors (see below), whose sum is σ = 50125824. Its totient is φ = 5454336.

The previous prime is 20669729. The next prime is 20669767. The reversal of 20669730 is 3796602.

It is a junction number, because it is equal to n+sod(n) for n = 20669691 and 20669700.

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, 642 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (1566432).

Almost surely, 2^20669730 is an apocalyptic number.

20669730 is an abundant number, since it is smaller than the sum of its proper divisors (29456094).

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

20669730 is a wasteful number, since it uses less digits than its factorization.

20669730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 20669730 is about 4546.3974749245. The cubic root of 20669730 is about 274.4384353027.

The spelling of 20669730 in words is "twenty million, six hundred sixty-nine thousand, seven hundred thirty".