20730996 has 72 divisors (see below), whose sum is σ = 61580064. Its totient is φ = 5797440.

The previous prime is 20730991. The next prime is 20731001. The reversal of 20730996 is 69903702.

It is an interprime number because it is at equal distance from previous prime (20730991) and next prime (20731001).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20730996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3135 + ... + 7161.

Almost surely, 2^20730996 is an apocalyptic number.

20730996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20730996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30790032).

20730996 is an abundant number, since it is smaller than the sum of its proper divisors (40849068).

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

20730996 is a wasteful number, since it uses less digits than its factorization.

20730996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061 (or 4056 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 20730996 is about 4553.1303517470. The cubic root of 20730996 is about 274.7093170905.

The spelling of 20730996 in words is "twenty million, seven hundred thirty thousand, nine hundred ninety-six".