20447379 has 24 divisors (see below), whose sum is σ = 31590000. Its totient is φ = 12699648.

The previous prime is 20447369. The next prime is 20447393. The reversal of 20447379 is 97374402.

It is not a de Polignac number, because 20447379 - 2¹⁶ = 20381843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20447369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15747 + ... + 16995.

It is an arithmetic number, because the mean of its divisors is an integer number (1316250).

Almost surely, 2^20447379 is an apocalyptic number.

20447379 is a deficient number, since it is larger than the sum of its proper divisors (11142621).

20447379 is a wasteful number, since it uses less digits than its factorization.

20447379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1376 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 20447379 is about 4521.8778178982. The cubic root of 20447379 is about 273.4508109264.

The spelling of 20447379 in words is "twenty million, four hundred forty-seven thousand, three hundred seventy-nine".