20401243 has 8 divisors (see below), whose sum is σ = 20971008. Its totient is φ = 19837224.

The previous prime is 20401223. The next prime is 20401273. The reversal of 20401243 is 34210402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401223) 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, 6330 + ... + 8992.

It is an arithmetic number, because the mean of its divisors is an integer number (2621376).

Almost surely, 2^20401243 is an apocalyptic number.

20401243 is a deficient number, since it is larger than the sum of its proper divisors (569765).

20401243 is a wasteful number, since it uses less digits than its factorization.

20401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20401243 is about 4516.7735165713. The cubic root of 20401243 is about 273.2449911148.

Adding to 20401243 its reverse (34210402), we get a palindrome (54611645).

The spelling of 20401243 in words is "twenty million, four hundred one thousand, two hundred forty-three".