20897934 has 8 divisors (see below), whose sum is σ = 41795880. Its totient is φ = 6965976.

The previous prime is 20897923. The next prime is 20897969. The reversal of 20897934 is 43979802.

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

20897934 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741489 + ... + 1741500.

It is an arithmetic number, because the mean of its divisors is an integer number (5224485).

Almost surely, 2^20897934 is an apocalyptic number.

20897934 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20897934 is a wasteful number, since it uses less digits than its factorization.

20897934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482994.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20897934 is about 4571.4258169635. The cubic root of 20897934 is about 275.4447195472. Note that the first 3 decimals are identical.

The spelling of 20897934 in words is "twenty million, eight hundred ninety-seven thousand, nine hundred thirty-four".