20381562 has 12 divisors (see below), whose sum is σ = 44160090. Its totient is φ = 6793848.

The previous prime is 20381549. The next prime is 20381567. The reversal of 20381562 is 26518302.

20381562 is a `hidden beast` number, since 20 + 3 + 81 + 562 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13771521 + 6610041 = 3711^2 + 2571^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20381567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566137 + ... + 566172.

Almost surely, 2^20381562 is an apocalyptic number.

20381562 is an abundant number, since it is smaller than the sum of its proper divisors (23778528).

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

20381562 is a wasteful number, since it uses less digits than its factorization.

20381562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132317 (or 1132314 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20381562 is about 4514.5943339352. The cubic root of 20381562 is about 273.1570967172.

Adding to 20381562 its reverse (26518302), we get a palindrome (46899864).

It can be divided in two parts, 2038 and 1562, that added together give a square (3600 = 60²).

The spelling of 20381562 in words is "twenty million, three hundred eighty-one thousand, five hundred sixty-two".