20729996 has 48 divisors (see below), whose sum is σ = 43122240. Its totient is φ = 8536320.

The previous prime is 20729993. The next prime is 20730011. The reversal of 20729996 is 69992702.

It is not an unprimeable number, because it can be changed into a prime (20729993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90410 + ... + 90638.

It is an arithmetic number, because the mean of its divisors is an integer number (898380).

Almost surely, 2^20729996 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 20729996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21561120).

20729996 is an abundant number, since it is smaller than the sum of its proper divisors (22392244).

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

20729996 is a wasteful number, since it uses less digits than its factorization.

20729996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 20729996 is about 4553.0205358641. The cubic root of 20729996 is about 274.7048999730.

It can be divided in two parts, 207 and 29996, that added together give a palindrome (30203).

The spelling of 20729996 in words is "twenty million, seven hundred twenty-nine thousand, nine hundred ninety-six".