20493812 has 6 divisors (see below), whose sum is σ = 35864178. Its totient is φ = 10246904.

The previous prime is 20493791. The next prime is 20493839. The reversal of 20493812 is 21839402.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 1865956 = 4316^2 + 1366^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561723 + ... + 2561730.

It is an arithmetic number, because the mean of its divisors is an integer number (5977363).

Almost surely, 2^20493812 is an apocalyptic number.

It is an amenable number.

20493812 is a deficient number, since it is larger than the sum of its proper divisors (15370366).

20493812 is a wasteful number, since it uses less digits than its factorization.

20493812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123457 (or 5123455 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20493812 is about 4527.0091672096. The cubic root of 20493812 is about 273.6576433440.

The spelling of 20493812 in words is "twenty million, four hundred ninety-three thousand, eight hundred twelve".