20369988 has 48 divisors (see below), whose sum is σ = 53948160. Its totient is φ = 6643872.

The previous prime is 20369981. The next prime is 20370011. The reversal of 20369988 is 88996302.

It is a super-2 number, since 2×20369988² = 829872822240288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20369981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3070 + ... + 7082.

It is an arithmetic number, because the mean of its divisors is an integer number (1123920).

Almost surely, 2^20369988 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 20369988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26974080).

20369988 is an abundant number, since it is smaller than the sum of its proper divisors (33578172).

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

20369988 is a wasteful number, since it uses less digits than its factorization.

20369988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073 (or 4065 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20369988 is about 4513.3123091583. The cubic root of 20369988 is about 273.1053813667.

The spelling of 20369988 in words is "twenty million, three hundred sixty-nine thousand, nine hundred eighty-eight".