20297740 has 12 divisors (see below), whose sum is σ = 42625296. Its totient is φ = 8119088.

The previous prime is 20297731. The next prime is 20297759. The reversal of 20297740 is 4779202.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507424 + ... + 507463.

It is an arithmetic number, because the mean of its divisors is an integer number (3552108).

Almost surely, 2^20297740 is an apocalyptic number.

20297740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20297740 is an abundant number, since it is smaller than the sum of its proper divisors (22327556).

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

20297740 is a wasteful number, since it uses less digits than its factorization.

20297740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014896 (or 1014894 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20297740 is about 4505.3013217764. The cubic root of 20297740 is about 272.7821167145.

The spelling of 20297740 in words is "twenty million, two hundred ninety-seven thousand, seven hundred forty".