20442658 has 8 divisors (see below), whose sum is σ = 30684780. Its totient is φ = 10214400.

The previous prime is 20442649. The next prime is 20442659. The reversal of 20442658 is 85624402.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 165649 = 4503^2 + 407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20442658² = 835804532209928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20442659) 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, 1858 + ... + 6658.

Almost surely, 2^20442658 is an apocalyptic number.

20442658 is a deficient number, since it is larger than the sum of its proper divisors (10242122).

20442658 is a wasteful number, since it uses less digits than its factorization.

20442658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 20442658 is about 4521.3557701203. The cubic root of 20442658 is about 273.4297640456.

The spelling of 20442658 in words is "twenty million, four hundred forty-two thousand, six hundred fifty-eight".