20703640 has 32 divisors (see below), whose sum is σ = 47670480. Its totient is φ = 8088192.

The previous prime is 20703619. The next prime is 20703653. The reversal of 20703640 is 4630702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4299 + ... + 7738.

Almost surely, 2^20703640 is an apocalyptic number.

20703640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20703640 is an abundant number, since it is smaller than the sum of its proper divisors (26966840).

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

20703640 is a wasteful number, since it uses less digits than its factorization.

20703640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12091 (or 12087 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20703640 is about 4550.1252730007. The cubic root of 20703640 is about 274.5884311796.

The spelling of 20703640 in words is "twenty million, seven hundred three thousand, six hundred forty".