20213801 has 4 divisors (see below), whose sum is σ = 20279952. Its totient is φ = 20147652.

The previous prime is 20213761. The next prime is 20213819. The reversal of 20213801 is 10831202.

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: 10831202 = 2 ⋅5415601.

It is a cyclic number.

It is not a de Polignac number, because 20213801 - 2¹⁴ = 20197417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20213801.

It is not an unprimeable number, because it can be changed into a prime (20413801) 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, 32615 + ... + 33228.

It is an arithmetic number, because the mean of its divisors is an integer number (5069988).

Almost surely, 2^20213801 is an apocalyptic number.

It is an amenable number.

20213801 is a deficient number, since it is larger than the sum of its proper divisors (66151).

20213801 is an equidigital number, since it uses as much as digits as its factorization.

20213801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66150.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20213801 is about 4495.9760897941. The cubic root of 20213801 is about 272.4055773636.

The spelling of 20213801 in words is "twenty million, two hundred thirteen thousand, eight hundred one".