20406650 has 36 divisors (see below), whose sum is σ = 41733006. Its totient is φ = 7418400.

The previous prime is 20406641. The next prime is 20406667. The reversal of 20406650 is 5660402.

It can be written as a sum of positive squares in 3 ways, for example, as 19651489 + 755161 = 4433^2 + 869^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4364 + ... + 7736.

Almost surely, 2^20406650 is an apocalyptic number.

20406650 is an abundant number, since it is smaller than the sum of its proper divisors (21326356).

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

20406650 is a wasteful number, since it uses less digits than its factorization.

20406650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407 (or 3391 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20406650 is about 4517.3720236438. The cubic root of 20406650 is about 273.2691286173.

The spelling of 20406650 in words is "twenty million, four hundred six thousand, six hundred fifty".