20921088 has 36 divisors (see below), whose sum is σ = 55682648. Its totient is φ = 6973440.

The previous prime is 20921083. The next prime is 20921119. The reversal of 20921088 is 88012902.

It is not an unprimeable number, because it can be changed into a prime (20921081) 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, 12853 + ... + 14388.

Almost surely, 2^20921088 is an apocalyptic number.

It is an amenable number.

20921088 is an abundant number, since it is smaller than the sum of its proper divisors (34761560).

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

20921088 is an equidigital number, since it uses as much as digits as its factorization.

20921088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27260 (or 27246 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20921088 is about 4573.9575861610. The cubic root of 20921088 is about 275.5464089152.

The spelling of 20921088 in words is "twenty million, nine hundred twenty-one thousand, eighty-eight".