20606040 has 384 divisors, whose sum is σ = 89631360. Its totient is φ = 3981312.

The previous prime is 20606017. The next prime is 20606063. The reversal of 20606040 is 4060602.

20606040 is a `hidden beast` number, since 2 + 0 + 60 + 604 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20606017) and next prime (20606063).

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 polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 556902 + ... + 556938.

It is an arithmetic number, because the mean of its divisors is an integer number (233415).

Almost surely, 2^20606040 is an apocalyptic number.

20606040 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 20606040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44815680).

20606040 is an abundant number, since it is smaller than the sum of its proper divisors (69025320).

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

20606040 is a wasteful number, since it uses less digits than its factorization.

20606040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20606040 is about 4539.3876238982. The cubic root of 20606040 is about 274.1562679738.

Adding to 20606040 its reverse (4060602), we get a palindrome (24666642).

It can be divided in two parts, 2060 and 6040, that added together give a square (8100 = 90²).

The spelling of 20606040 in words is "twenty million, six hundred six thousand, forty".