20257730 has 16 divisors (see below), whose sum is σ = 37312704. Its totient is φ = 7914480.

The previous prime is 20257729. The next prime is 20257751. The reversal of 20257730 is 3775202.

It is a self number, because there is not a number n which added to its sum of digits gives 20257730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23126 + ... + 23985.

It is an arithmetic number, because the mean of its divisors is an integer number (2332044).

Almost surely, 2^20257730 is an apocalyptic number.

20257730 is a deficient number, since it is larger than the sum of its proper divisors (17054974).

20257730 is a wasteful number, since it uses less digits than its factorization.

20257730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47161.

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 20257730 is about 4500.8588069390. The cubic root of 20257730 is about 272.6027668391.

The spelling of 20257730 in words is "twenty million, two hundred fifty-seven thousand, seven hundred thirty".