20488257 has 12 divisors (see below), whose sum is σ = 30011904. Its totient is φ = 13466040.

The previous prime is 20488231. The next prime is 20488291. The reversal of 20488257 is 75288402.

It is a happy number.

It is not a de Polignac number, because 20488257 - 2⁷ = 20488129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20488057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15393 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (2500992).

Almost surely, 2^20488257 is an apocalyptic number.

It is an amenable number.

20488257 is a deficient number, since it is larger than the sum of its proper divisors (9523647).

20488257 is a wasteful number, since it uses less digits than its factorization.

20488257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32140 (or 32137 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20488257 is about 4526.3955858939. The cubic root of 20488257 is about 273.6329154639.

The spelling of 20488257 in words is "twenty million, four hundred eighty-eight thousand, two hundred fifty-seven".