20401799 has 4 divisors (see below), whose sum is σ = 22256520. Its totient is φ = 18547080.

The previous prime is 20401793. The next prime is 20401831. The reversal of 20401799 is 99710402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20401799 - 2⁴ = 20401783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927344 + ... + 927365.

It is an arithmetic number, because the mean of its divisors is an integer number (5564130).

Almost surely, 2^20401799 is an apocalyptic number.

20401799 is a deficient number, since it is larger than the sum of its proper divisors (1854721).

20401799 is a wasteful number, since it uses less digits than its factorization.

20401799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854720.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20401799 is about 4516.8350645114. The cubic root of 20401799 is about 273.2474733628.

The spelling of 20401799 in words is "twenty million, four hundred one thousand, seven hundred ninety-nine".