20392490 has 16 divisors (see below), whose sum is σ = 38302848. Its totient is φ = 7802256.

The previous prime is 20392459. The next prime is 20392499. The reversal of 20392490 is 9429302.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20392499) 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, 44102 + ... + 44561.

It is an arithmetic number, because the mean of its divisors is an integer number (2393928).

Almost surely, 2^20392490 is an apocalyptic number.

20392490 is a deficient number, since it is larger than the sum of its proper divisors (17910358).

20392490 is a wasteful number, since it uses less digits than its factorization.

20392490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88693.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20392490 is about 4515.8044687519. The cubic root of 20392490 is about 273.2059076214.

The spelling of 20392490 in words is "twenty million, three hundred ninety-two thousand, four hundred ninety".