20642258 has 32 divisors (see below), whose sum is σ = 39432960. Its totient is φ = 7882560.

The previous prime is 20642257. The next prime is 20642269. The reversal of 20642258 is 85224602.

It is a super-2 number, since 2×20642258² = 852205630677128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 20642258.

It is not an unprimeable number, because it can be changed into a prime (20642257) 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, 3323 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (1232280).

Almost surely, 2^20642258 is an apocalyptic number.

20642258 is a deficient number, since it is larger than the sum of its proper divisors (18790702).

20642258 is a wasteful number, since it uses less digits than its factorization.

20642258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 20642258 is about 4543.3751771123. The cubic root of 20642258 is about 274.3167966336.

The spelling of 20642258 in words is "twenty million, six hundred forty-two thousand, two hundred fifty-eight".