20988361 has 8 divisors (see below), whose sum is σ = 21614400. Its totient is φ = 20365488.

The previous prime is 20988349. The next prime is 20988377. The reversal of 20988361 is 16388902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20988361 - 2⁹ = 20987849 is a prime.

It is a super-2 number, since 2×20988361² = 881022594932642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20988361.

It is not an unprimeable number, because it can be changed into a prime (20988301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21690 + ... + 22636.

It is an arithmetic number, because the mean of its divisors is an integer number (2701800).

Almost surely, 2^20988361 is an apocalyptic number.

It is an amenable number.

20988361 is a deficient number, since it is larger than the sum of its proper divisors (626039).

20988361 is an equidigital number, since it uses as much as digits as its factorization.

20988361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20988361 is about 4581.3055999355. The cubic root of 20988361 is about 275.8414381894.

The spelling of 20988361 in words is "twenty million, nine hundred eighty-eight thousand, three hundred sixty-one".