20213588 has 6 divisors (see below), whose sum is σ = 35373786. Its totient is φ = 10106792.

The previous prime is 20213563. The next prime is 20213603. The reversal of 20213588 is 88531202.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 6091024 = 3758^2 + 2468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20213588.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2526695 + ... + 2526702.

It is an arithmetic number, because the mean of its divisors is an integer number (5895631).

Almost surely, 2^20213588 is an apocalyptic number.

It is an amenable number.

20213588 is a deficient number, since it is larger than the sum of its proper divisors (15160198).

20213588 is a wasteful number, since it uses less digits than its factorization.

20213588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5053401 (or 5053399 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20213588 is about 4495.9524018833. The cubic root of 20213588 is about 272.4046205488.

The spelling of 20213588 in words is "twenty million, two hundred thirteen thousand, five hundred eighty-eight".