20090920 has 32 divisors (see below), whose sum is σ = 45661320. Its totient is φ = 7955200.

The previous prime is 20090909. The next prime is 20090927. The reversal of 20090920 is 2909002.

It can be written as a sum of positive squares in 4 ways, for example, as 19909444 + 181476 = 4462^2 + 426^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20090891 and 20090900.

It is not an unprimeable number, because it can be changed into a prime (20090927) 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, 1554 + ... + 6526.

Almost surely, 2^20090920 is an apocalyptic number.

20090920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20090920 is an abundant number, since it is smaller than the sum of its proper divisors (25570400).

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

20090920 is a wasteful number, since it uses less digits than its factorization.

20090920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085 (or 5081 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20090920 is about 4482.2895935002. The cubic root of 20090920 is about 271.8524646843.

Adding to 20090920 its reverse (2909002), we get a palindrome (22999922).

The spelling of 20090920 in words is "twenty million, ninety thousand, nine hundred twenty".