20399948 has 6 divisors (see below), whose sum is σ = 35699916. Its totient is φ = 10199972.

The previous prime is 20399947. The next prime is 20399969. The reversal of 20399948 is 84999302.

It is a junction number, because it is equal to n+sod(n) for n = 20399899 and 20399908.

It is not an unprimeable number, because it can be changed into a prime (20399947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2549990 + ... + 2549997.

It is an arithmetic number, because the mean of its divisors is an integer number (5949986).

Almost surely, 2^20399948 is an apocalyptic number.

It is an amenable number.

20399948 is a deficient number, since it is larger than the sum of its proper divisors (15299968).

20399948 is a wasteful number, since it uses less digits than its factorization.

20399948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5099991 (or 5099989 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 20399948 is about 4516.6301597541. The cubic root of 20399948 is about 273.2392094450.

The spelling of 20399948 in words is "twenty million, three hundred ninety-nine thousand, nine hundred forty-eight".