20257700 has 18 divisors (see below), whose sum is σ = 43959426. Its totient is φ = 8103040.

The previous prime is 20257697. The next prime is 20257703. The reversal of 20257700 is 775202.

It is an interprime number because it is at equal distance from previous prime (20257697) and next prime (20257703).

It can be written as a sum of positive squares in 3 ways, for example, as 1784896 + 18472804 = 1336^2 + 4298^2 .

It is not an unprimeable number, because it can be changed into a prime (20257703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101189 + ... + 101388.

Almost surely, 2^20257700 is an apocalyptic number.

20257700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20257700 is an abundant number, since it is smaller than the sum of its proper divisors (23701726).

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

20257700 is a wasteful number, since it uses less digits than its factorization.

20257700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202591 (or 202584 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20257700 is about 4500.8554742404. The cubic root of 20257700 is about 272.6026322717.

The spelling of 20257700 in words is "twenty million, two hundred fifty-seven thousand, seven hundred".