20620440 has 128 divisors (see below), whose sum is σ = 70084800. Its totient is φ = 5391360.

The previous prime is 20620429. The next prime is 20620469. The reversal of 20620440 is 4402602.

20620440 is a `hidden beast` number, since 2 + 0 + 620 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65724 + ... + 66036.

Almost surely, 2^20620440 is an apocalyptic number.

20620440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20620440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35042400).

20620440 is an abundant number, since it is smaller than the sum of its proper divisors (49464360).

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

20620440 is a wasteful number, since it uses less digits than its factorization.

20620440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20620440 is about 4540.9734639172. The cubic root of 20620440 is about 274.2201154509.

The spelling of 20620440 in words is "twenty million, six hundred twenty thousand, four hundred forty".