20509092 has 48 divisors (see below), whose sum is σ = 54190080. Its totient is φ = 6705504.

The previous prime is 20509081. The next prime is 20509109. The reversal of 20509092 is 29090502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3933 + ... + 7515.

It is an arithmetic number, because the mean of its divisors is an integer number (1128960).

Almost surely, 2^20509092 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 20509092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27095040).

20509092 is an abundant number, since it is smaller than the sum of its proper divisors (33680988).

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

20509092 is a wasteful number, since it uses less digits than its factorization.

20509092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649 (or 3641 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20509092 is about 4528.6965012021. The cubic root of 20509092 is about 273.7256386653.

Adding to 20509092 its reverse (29090502), we get a palindrome (49599594).

The spelling of 20509092 in words is "twenty million, five hundred nine thousand, ninety-two".