20931946 has 16 divisors (see below), whose sum is σ = 35976960. Its totient is φ = 8947440.

The previous prime is 20931943. The next prime is 20931949. The reversal of 20931946 is 64913902.

It is an interprime number because it is at equal distance from previous prime (20931943) and next prime (20931949).

It is not an unprimeable number, because it can be changed into a prime (20931941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4300 + ... + 7768.

It is an arithmetic number, because the mean of its divisors is an integer number (2248560).

Almost surely, 2^20931946 is an apocalyptic number.

20931946 is a deficient number, since it is larger than the sum of its proper divisors (15045014).

20931946 is a wasteful number, since it uses less digits than its factorization.

20931946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20931946 is about 4575.1443693068. The cubic root of 20931946 is about 275.5940700034.

The spelling of 20931946 in words is "twenty million, nine hundred thirty-one thousand, nine hundred forty-six".