20265988 has 6 divisors (see below), whose sum is σ = 35465486. Its totient is φ = 10132992.

The previous prime is 20265941. The next prime is 20265997. The reversal of 20265988 is 88956202.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 5992704 = 3778^2 + 2448^2 .

It is a super-2 number, since 2×20265988² = 821420539232288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20265988.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2533245 + ... + 2533252.

Almost surely, 2^20265988 is an apocalyptic number.

It is an amenable number.

20265988 is a deficient number, since it is larger than the sum of its proper divisors (15199498).

20265988 is a wasteful number, since it uses less digits than its factorization.

20265988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066501 (or 5066499 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 20265988 is about 4501.7760939434. The cubic root of 20265988 is about 272.6398036941.

The spelling of 20265988 in words is "twenty million, two hundred sixty-five thousand, nine hundred eighty-eight".