20305894 has 24 divisors (see below), whose sum is σ = 35589888. Its totient is φ = 8663760.

The previous prime is 20305861. The next prime is 20305897. The reversal of 20305894 is 49850302.

It is a super-2 number, since 2×20305894² = 824658662278472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305897) 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, 37264 + ... + 37804.

It is an arithmetic number, because the mean of its divisors is an integer number (1482912).

Almost surely, 2^20305894 is an apocalyptic number.

20305894 is a deficient number, since it is larger than the sum of its proper divisors (15283994).

20305894 is a wasteful number, since it uses less digits than its factorization.

20305894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20305894 is about 4506.2061648353. The cubic root of 20305894 is about 272.8186391320.

The spelling of 20305894 in words is "twenty million, three hundred five thousand, eight hundred ninety-four".