20511342 has 12 divisors (see below), whose sum is σ = 44441280. Its totient is φ = 6837108.

The previous prime is 20511341. The next prime is 20511347. The reversal of 20511342 is 24311502.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1139519 = 20511342 / (2 + 0 + 5 + 1 + 1 + 3 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511341) 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, 569742 + ... + 569777.

It is an arithmetic number, because the mean of its divisors is an integer number (3703440).

Almost surely, 2^20511342 is an apocalyptic number.

20511342 is an abundant number, since it is smaller than the sum of its proper divisors (23929938).

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

20511342 is a wasteful number, since it uses less digits than its factorization.

20511342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139527 (or 1139524 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20511342 is about 4528.9449102412. The cubic root of 20511342 is about 273.7356482124.

Adding to 20511342 its reverse (24311502), we get a palindrome (44822844).

The spelling of 20511342 in words is "twenty million, five hundred eleven thousand, three hundred forty-two".