20641020 has 24 divisors (see below), whose sum is σ = 57795024. Its totient is φ = 5504256.

The previous prime is 20641013. The next prime is 20641039. The reversal of 20641020 is 2014602.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171949 + ... + 172068.

It is an arithmetic number, because the mean of its divisors is an integer number (2408126).

Almost surely, 2^20641020 is an apocalyptic number.

20641020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20641020 is an abundant number, since it is smaller than the sum of its proper divisors (37154004).

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

20641020 is a wasteful number, since it uses less digits than its factorization.

20641020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344029 (or 344027 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20641020 is about 4543.2389327439. The cubic root of 20641020 is about 274.3113125601.

Adding to 20641020 its reverse (2014602), we get a palindrome (22655622).

The spelling of 20641020 in words is "twenty million, six hundred forty-one thousand, twenty".