20399074 has 4 divisors (see below), whose sum is σ = 30598614. Its totient is φ = 10199536.

The previous prime is 20399059. The next prime is 20399087. The reversal of 20399074 is 47099302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47099302 = 2 ⋅23549651.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 552049 = 4455^2 + 743^2 .

It is a super-2 number, since 2×20399074² = 832244440114952, which contains 22 as substring.

It is an unprimeable number.

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, 5099767 + ... + 5099770.

Almost surely, 2^20399074 is an apocalyptic number.

20399074 is a deficient number, since it is larger than the sum of its proper divisors (10199540).

20399074 is a wasteful number, since it uses less digits than its factorization.

20399074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10199539.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20399074 is about 4516.5334051682. The cubic root of 20399074 is about 273.2353072377.

The spelling of 20399074 in words is "twenty million, three hundred ninety-nine thousand, seventy-four".