20039257 has 4 divisors (see below), whose sum is σ = 22902016. Its totient is φ = 17176500.

The previous prime is 20039251. The next prime is 20039263. The reversal of 20039257 is 75293002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20039251) and next prime (20039263).

It is a cyclic number.

It is not a de Polignac number, because 20039257 - 2¹⁵ = 20006489 is a prime.

It is a super-2 number, since 2×20039257² = 803143642224098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20039251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431369 + ... + 1431382.

It is an arithmetic number, because the mean of its divisors is an integer number (5725504).

Almost surely, 2^20039257 is an apocalyptic number.

It is an amenable number.

20039257 is a deficient number, since it is larger than the sum of its proper divisors (2862759).

20039257 is an equidigital number, since it uses as much as digits as its factorization.

20039257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862758.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 20039257 is about 4476.5228693708. The cubic root of 20039257 is about 271.6192454061.

The spelling of 20039257 in words is "twenty million, thirty-nine thousand, two hundred fifty-seven".