20308992 has 88 divisors (see below), whose sum is σ = 59150112. Its totient is φ = 6144000.

The previous prime is 20308991. The next prime is 20308993. The reversal of 20308992 is 29980302.

It is an interprime number because it is at equal distance from previous prime (20308991) and next prime (20308993).

It is a tau number, because it is divible by the number of its divisors (88).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20308991) 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, 33492 + ... + 34092.

Almost surely, 2^20308992 is an apocalyptic number.

20308992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20308992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29575056).

20308992 is an abundant number, since it is smaller than the sum of its proper divisors (38841120).

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

20308992 is a wasteful number, since it uses less digits than its factorization.

20308992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20308992 is about 4506.5498998680. The cubic root of 20308992 is about 272.8325127585.

The spelling of 20308992 in words is "twenty million, three hundred eight thousand, nine hundred ninety-two".