20409036 has 48 divisors (see below), whose sum is σ = 49824768. Its totient is φ = 6494400.

The previous prime is 20409019. The next prime is 20409041. The reversal of 20409036 is 63090402.

It is a junction number, because it is equal to n+sod(n) for n = 20408997 and 20409015.

It is a congruent number.

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, 30546 + ... + 31206.

It is an arithmetic number, because the mean of its divisors is an integer number (1038016).

Almost surely, 2^20409036 is an apocalyptic number.

It is an amenable number.

20409036 is an abundant number, since it is smaller than the sum of its proper divisors (29415732).

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

20409036 is a wasteful number, since it uses less digits than its factorization.

20409036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20409036 is about 4517.6361075235. The cubic root of 20409036 is about 273.2797786543.

Adding to 20409036 its reverse (63090402), we get a palindrome (83499438).

The spelling of 20409036 in words is "twenty million, four hundred nine thousand, thirty-six".