20606440 has 32 divisors (see below), whose sum is σ = 47006280. Its totient is φ = 8128512.

The previous prime is 20606429. The next prime is 20606461. The reversal of 20606440 is 4460602.

It can be written as a sum of positive squares in 4 ways, for example, as 20557156 + 49284 = 4534^2 + 222^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609 + ... + 6448.

Almost surely, 2^20606440 is an apocalyptic number.

20606440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20606440 is an abundant number, since it is smaller than the sum of its proper divisors (26399840).

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

20606440 is a wasteful number, since it uses less digits than its factorization.

20606440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141 (or 7137 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20606440 is about 4539.4316824907. The cubic root of 20606440 is about 274.1580419164.

The spelling of 20606440 in words is "twenty million, six hundred six thousand, four hundred forty".