20239390 has 32 divisors (see below), whose sum is σ = 38115360. Its totient is φ = 7728000.

The previous prime is 20239381. The next prime is 20239399. The reversal of 20239390 is 9393202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20239381) and next prime (20239399).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20239399) 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, 28945 + ... + 29635.

It is an arithmetic number, because the mean of its divisors is an integer number (1191105).

Almost surely, 2^20239390 is an apocalyptic number.

20239390 is a deficient number, since it is larger than the sum of its proper divisors (17875970).

20239390 is a wasteful number, since it uses less digits than its factorization.

20239390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 20239390 is about 4498.8209566508. The cubic root of 20239390 is about 272.5204765355.

The spelling of 20239390 in words is "twenty million, two hundred thirty-nine thousand, three hundred ninety".