20401447 has 12 divisors (see below), whose sum is σ = 22604680. Its totient is φ = 18398160.

The previous prime is 20401439. The next prime is 20401453. The reversal of 20401447 is 74410402.

It is not a de Polignac number, because 20401447 - 2³ = 20401439 is a prime.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16213 + ... + 17425.

Almost surely, 2^20401447 is an apocalyptic number.

20401447 is a deficient number, since it is larger than the sum of its proper divisors (2203233).

20401447 is a wasteful number, since it uses less digits than its factorization.

20401447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374 (or 1363 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20401447 is about 4516.7960990065. The cubic root of 20401447 is about 273.2459018729.

Adding to 20401447 its reverse (74410402), we get a palindrome (94811849).

The spelling of 20401447 in words is "twenty million, four hundred one thousand, four hundred forty-seven".