20447701 has 4 divisors (see below), whose sum is σ = 20457504. Its totient is φ = 20437900.

The previous prime is 20447699. The next prime is 20447711. The reversal of 20447701 is 10774402.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10774402 = 2 ⋅5387201.

It is a cyclic number.

It is not a de Polignac number, because 20447701 - 2¹ = 20447699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447711) 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, 385 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (5114376).

Almost surely, 2^20447701 is an apocalyptic number.

It is an amenable number.

20447701 is a deficient number, since it is larger than the sum of its proper divisors (9803).

20447701 is an equidigital number, since it uses as much as digits as its factorization.

20447701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9802.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20447701 is about 4521.9134224352. The cubic root of 20447701 is about 273.4522463296.

The spelling of 20447701 in words is "twenty million, four hundred forty-seven thousand, seven hundred one".