20000757 has 16 divisors (see below), whose sum is σ = 31302272. Its totient is φ = 11119680.

The previous prime is 20000753. The next prime is 20000779. The reversal of 20000757 is 75700002.

It is not a de Polignac number, because 20000757 - 2² = 20000753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000753) 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, 12094 + ... + 13647.

It is an arithmetic number, because the mean of its divisors is an integer number (1956392).

Almost surely, 2^20000757 is an apocalyptic number.

It is an amenable number.

20000757 is a deficient number, since it is larger than the sum of its proper divisors (11301515).

20000757 is a wasteful number, since it uses less digits than its factorization.

20000757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25788.

The product of its (nonzero) digits is 490, while the sum is 21.

The square root of 20000757 is about 4472.2205893717. The cubic root of 20000757 is about 271.4451863065.

Adding to 20000757 its reverse (75700002), we get a palindrome (95700759).

The spelling of 20000757 in words is "twenty million, seven hundred fifty-seven", and thus it is an aban number.