20411620 has 24 divisors (see below), whose sum is σ = 42981624. Its totient is φ = 8142336.

The previous prime is 20411593. The next prime is 20411623. The reversal of 20411620 is 2611402.

It can be written as a sum of positive squares in 4 ways, for example, as 107584 + 20304036 = 328^2 + 4506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20411594 and 20411603.

It is not an unprimeable number, because it can be changed into a prime (20411623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7482 + ... + 9838.

It is an arithmetic number, because the mean of its divisors is an integer number (1790901).

Almost surely, 2^20411620 is an apocalyptic number.

20411620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20411620 is an abundant number, since it is smaller than the sum of its proper divisors (22570004).

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

20411620 is a wasteful number, since it uses less digits than its factorization.

20411620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2797 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20411620 is about 4517.9220887483. The cubic root of 20411620 is about 273.2913115385.

The spelling of 20411620 in words is "twenty million, four hundred eleven thousand, six hundred twenty".