20947438 has 8 divisors (see below), whose sum is σ = 31500720. Its totient is φ = 10447200.

The previous prime is 20947429. The next prime is 20947469. The reversal of 20947438 is 83474902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20947397 and 20947406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12258 + ... + 13861.

It is an arithmetic number, because the mean of its divisors is an integer number (3937590).

Almost surely, 2^20947438 is an apocalyptic number.

20947438 is a deficient number, since it is larger than the sum of its proper divisors (10553282).

20947438 is a wasteful number, since it uses less digits than its factorization.

20947438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26522.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20947438 is about 4576.8371174863. The cubic root of 20947438 is about 275.6620434647.

The spelling of 20947438 in words is "twenty million, nine hundred forty-seven thousand, four hundred thirty-eight".