20494680 has 64 divisors (see below), whose sum is σ = 61832160. Its totient is φ = 5434368.

The previous prime is 20494667. The next prime is 20494699. The reversal of 20494680 is 8649402.

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, 27594 + ... + 28326.

Almost surely, 2^20494680 is an apocalyptic number.

20494680 is a gapful number since it is divisible by the number (20) 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 20494680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30916080).

20494680 is an abundant number, since it is smaller than the sum of its proper divisors (41337480).

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

20494680 is a wasteful number, since it uses less digits than its factorization.

20494680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20494680 is about 4527.1050352295. The cubic root of 20494680 is about 273.6615068107.

The spelling of 20494680 in words is "twenty million, four hundred ninety-four thousand, six hundred eighty".