20813401 has 4 divisors (see below), whose sum is σ = 23786752. Its totient is φ = 17840052.

The previous prime is 20813399. The next prime is 20813447. The reversal of 20813401 is 10431802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10431802 = 2 ⋅5215901.

It is a cyclic number.

It is not a de Polignac number, because 20813401 - 2¹ = 20813399 is a prime.

It is a super-2 number, since 2×20813401² = 866395322373602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20813101) 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, 1486665 + ... + 1486678.

It is an arithmetic number, because the mean of its divisors is an integer number (5946688).

Almost surely, 2^20813401 is an apocalyptic number.

It is an amenable number.

20813401 is a deficient number, since it is larger than the sum of its proper divisors (2973351).

20813401 is an equidigital number, since it uses as much as digits as its factorization.

20813401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973350.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20813401 is about 4562.1706456467. The cubic root of 20813401 is about 275.0728225875.

The spelling of 20813401 in words is "twenty million, eight hundred thirteen thousand, four hundred one".