20881004 has 6 divisors (see below), whose sum is σ = 36541764. Its totient is φ = 10440500.

The previous prime is 20881001. The next prime is 20881027. The reversal of 20881004 is 40018802.

It is not an unprimeable number, because it can be changed into a prime (20881001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610122 + ... + 2610129.

It is an arithmetic number, because the mean of its divisors is an integer number (6090294).

Almost surely, 2^20881004 is an apocalyptic number.

It is an amenable number.

20881004 is a deficient number, since it is larger than the sum of its proper divisors (15660760).

20881004 is a wasteful number, since it uses less digits than its factorization.

20881004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220255 (or 5220253 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20881004 is about 4569.5737219132. The cubic root of 20881004 is about 275.3703176318.

Adding to 20881004 its reverse (40018802), we get a palindrome (60899806).

The spelling of 20881004 in words is "twenty million, eight hundred eighty-one thousand, four".