20620842 has 32 divisors (see below), whose sum is σ = 45468864. Its totient is φ = 6182400.

The previous prime is 20620837. The next prime is 20620843. The reversal of 20620842 is 24802602.

It is not an unprimeable number, because it can be changed into a prime (20620843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4792 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (1420902).

Almost surely, 2^20620842 is an apocalyptic number.

20620842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20620842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22734432).

20620842 is an abundant number, since it is smaller than the sum of its proper divisors (24848022).

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

20620842 is a wasteful number, since it uses less digits than its factorization.

20620842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20620842 is about 4541.0177273382. The cubic root of 20620842 is about 274.2218974331.

The spelling of 20620842 in words is "twenty million, six hundred twenty thousand, eight hundred forty-two".