20213388 has 60 divisors (see below), whose sum is σ = 56918400. Its totient is φ = 6218208.

The previous prime is 20213353. The next prime is 20213399. The reversal of 20213388 is 88331202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1813 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (948640).

Almost surely, 2^20213388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20213388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28459200).

20213388 is an abundant number, since it is smaller than the sum of its proper divisors (36705012).

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

20213388 is a wasteful number, since it uses less digits than its factorization.

20213388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4828 (or 4817 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20213388 is about 4495.9301595999. The cubic root of 20213388 is about 272.4037221250.

The spelling of 20213388 in words is "twenty million, two hundred thirteen thousand, three hundred eighty-eight".