20342890 has 16 divisors (see below), whose sum is σ = 37218600. Its totient is φ = 8003520.

The previous prime is 20342887. The next prime is 20342899. The reversal of 20342890 is 9824302.

It can be written as a sum of positive squares in 4 ways, for example, as 16410601 + 3932289 = 4051^2 + 1983^2 .

It is not an unprimeable number, because it can be changed into a prime (20342899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16065 + ... + 17284.

Almost surely, 2^20342890 is an apocalyptic number.

20342890 is a deficient number, since it is larger than the sum of its proper divisors (16875710).

20342890 is a wasteful number, since it uses less digits than its factorization.

20342890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33417.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20342890 is about 4510.3093020324. The cubic root of 20342890 is about 272.9842244682.

The spelling of 20342890 in words is "twenty million, three hundred forty-two thousand, eight hundred ninety".