20145846 has 32 divisors (see below), whose sum is σ = 47536128. Its totient is φ = 5569920.

The previous prime is 20145821. The next prime is 20145847. The reversal of 20145846 is 64854102.

It is a super-2 number, since 2×20145846² = 811710222111432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6435 + ... + 9038.

It is an arithmetic number, because the mean of its divisors is an integer number (1485504).

Almost surely, 2^20145846 is an apocalyptic number.

20145846 is an abundant number, since it is smaller than the sum of its proper divisors (27390282).

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

20145846 is a wasteful number, since it uses less digits than its factorization.

20145846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15516.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20145846 is about 4488.4124142062. The cubic root of 20145846 is about 272.0999758639.

Adding to 20145846 its reverse (64854102), we get a palindrome (84999948).

The spelling of 20145846 in words is "twenty million, one hundred forty-five thousand, eight hundred forty-six".