20420636 has 12 divisors (see below), whose sum is σ = 35973840. Its totient is φ = 10142400.

The previous prime is 20420627. The next prime is 20420639. The reversal of 20420636 is 63602402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16301 + ... + 17508.

It is an arithmetic number, because the mean of its divisors is an integer number (2997820).

Almost surely, 2^20420636 is an apocalyptic number.

It is an amenable number.

20420636 is a deficient number, since it is larger than the sum of its proper divisors (15553204).

20420636 is a wasteful number, since it uses less digits than its factorization.

20420636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33964 (or 33962 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20420636 is about 4518.9197824259. The cubic root of 20420636 is about 273.3315440428.

The spelling of 20420636 in words is "twenty million, four hundred twenty thousand, six hundred thirty-six".