20499836 has 36 divisors (see below), whose sum is σ = 42766416. Its totient is φ = 8568000.

The previous prime is 20499833. The next prime is 20499847. The reversal of 20499836 is 63899402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 20499793 and 20499802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6761 + ... + 9311.

It is an arithmetic number, because the mean of its divisors is an integer number (1187956).

Almost surely, 2^20499836 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 20499836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21383208).

20499836 is an abundant number, since it is smaller than the sum of its proper divisors (22266580).

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

20499836 is a wasteful number, since it uses less digits than its factorization.

20499836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610 (or 2601 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20499836 is about 4527.6744582622. The cubic root of 20499836 is about 273.6844539108.

The spelling of 20499836 in words is "twenty million, four hundred ninety-nine thousand, eight hundred thirty-six".