20710740 has 48 divisors (see below), whose sum is σ = 59411520. Its totient is φ = 5387520.

The previous prime is 20710733. The next prime is 20710747. The reversal of 20710740 is 4701702.

It is an interprime number because it is at equal distance from previous prime (20710733) and next prime (20710747).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20710747) 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, 1750 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (1237740).

Almost surely, 2^20710740 is an apocalyptic number.

20710740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20710740 is an abundant number, since it is smaller than the sum of its proper divisors (38700780).

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

20710740 is a wasteful number, since it uses less digits than its factorization.

20710740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472 (or 8470 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 20710740 is about 4550.9054044223. The cubic root of 20710740 is about 274.6198162411.

The spelling of 20710740 in words is "twenty million, seven hundred ten thousand, seven hundred forty".