20901888 has 182 divisors, whose sum is σ = 71622104. Its totient is φ = 5971968.

The previous prime is 20901863. The next prime is 20901889. The reversal of 20901888 is 88810902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901889) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2985981 + ... + 2985987.

Almost surely, 2^20901888 is an apocalyptic number.

20901888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20901888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35811052).

20901888 is an abundant number, since it is smaller than the sum of its proper divisors (50720216).

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

20901888 is an frugal number, since it uses more digits than its factorization.

20901888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 20901888 is about 4571.8582655196. The cubic root of 20901888 is about 275.4620903192.

The spelling of 20901888 in words is "twenty million, nine hundred one thousand, eight hundred eighty-eight".