20956347 has 12 divisors (see below), whose sum is σ = 31081720. Its totient is φ = 13955040.

The previous prime is 20956343. The next prime is 20956379. The reversal of 20956347 is 74365902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20956347 - 2² = 20956343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20956343) 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, 23347 + ... + 24227.

Almost surely, 2^20956347 is an apocalyptic number.

20956347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20956347 is a deficient number, since it is larger than the sum of its proper divisors (10125373).

20956347 is an frugal number, since it uses more digits than its factorization.

20956347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20956347 is about 4577.8102844045. The cubic root of 20956347 is about 275.7011178543.

The spelling of 20956347 in words is "twenty million, nine hundred fifty-six thousand, three hundred forty-seven".