20881020 has 24 divisors (see below), whose sum is σ = 58467024. Its totient is φ = 5568256.

The previous prime is 20881001. The next prime is 20881027. The reversal of 20881020 is 2018802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881027) 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, 173949 + ... + 174068.

It is an arithmetic number, because the mean of its divisors is an integer number (2436126).

Almost surely, 2^20881020 is an apocalyptic number.

20881020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20881020 is an abundant number, since it is smaller than the sum of its proper divisors (37586004).

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

20881020 is a wasteful number, since it uses less digits than its factorization.

20881020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348029 (or 348027 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20881020 is about 4569.5754726233. The cubic root of 20881020 is about 275.3703879657.

Adding to 20881020 its reverse (2018802), we get a palindrome (22899822).

The spelling of 20881020 in words is "twenty million, eight hundred eighty-one thousand, twenty".