20745401 has 4 divisors (see below), whose sum is σ = 20828304. Its totient is φ = 20662500.

The previous prime is 20745343. The next prime is 20745421. The reversal of 20745401 is 10454702.

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.

It is a cyclic number.

It is not a de Polignac number, because 20745401 - 2¹⁰ = 20744377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20745421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41075 + ... + 41576.

It is an arithmetic number, because the mean of its divisors is an integer number (5207076).

Almost surely, 2^20745401 is an apocalyptic number.

It is an amenable number.

20745401 is a deficient number, since it is larger than the sum of its proper divisors (82903).

20745401 is an equidigital number, since it uses as much as digits as its factorization.

20745401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82902.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20745401 is about 4554.7119557662. The cubic root of 20745401 is about 274.7729299131.

The spelling of 20745401 in words is "twenty million, seven hundred forty-five thousand, four hundred one".