20499738 has 40 divisors (see below), whose sum is σ = 47863488. Its totient is φ = 5852952.

The previous prime is 20499697. The next prime is 20499749. The reversal of 20499738 is 83799402.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20499738.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13695 + ... + 15117.

Almost surely, 2^20499738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20499738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23931744).

20499738 is an abundant number, since it is smaller than the sum of its proper divisors (27363750).

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

20499738 is an equidigital number, since it uses as much as digits as its factorization.

20499738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20499738 is about 4527.6636359164. The cubic root of 20499738 is about 273.6840177916.

The spelling of 20499738 in words is "twenty million, four hundred ninety-nine thousand, seven hundred thirty-eight".