20850961 has 4 divisors (see below), whose sum is σ = 21948400. Its totient is φ = 19753524.

The previous prime is 20850953. The next prime is 20850967. The reversal of 20850961 is 16905802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20850961 - 2³ = 20850953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20850967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548691 + ... + 548728.

It is an arithmetic number, because the mean of its divisors is an integer number (5487100).

Almost surely, 2^20850961 is an apocalyptic number.

It is an amenable number.

20850961 is a deficient number, since it is larger than the sum of its proper divisors (1097439).

20850961 is a wasteful number, since it uses less digits than its factorization.

20850961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097438.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20850961 is about 4566.2852517117. The cubic root of 20850961 is about 275.2381892269.

The spelling of 20850961 in words is "twenty million, eight hundred fifty thousand, nine hundred sixty-one".