20842545 has 16 divisors (see below), whose sum is σ = 33751872. Its totient is φ = 10981440.

The previous prime is 20842543. The next prime is 20842553. The reversal of 20842545 is 54524802.

It is not a de Polignac number, because 20842545 - 2¹ = 20842543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20842543) 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, 7126 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (2109492).

Almost surely, 2^20842545 is an apocalyptic number.

It is an amenable number.

20842545 is a deficient number, since it is larger than the sum of its proper divisors (12909327).

20842545 is a wasteful number, since it uses less digits than its factorization.

20842545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16832.

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 20842545 is about 4565.3636218816. The cubic root of 20842545 is about 275.2011531030.

The spelling of 20842545 in words is "twenty million, eight hundred forty-two thousand, five hundred forty-five".