20513042 has 16 divisors (see below), whose sum is σ = 33760800. Its totient is φ = 9270240.

The previous prime is 20513039. The next prime is 20513057. The reversal of 20513042 is 24031502.

It is a self number, because there is not a number n which added to its sum of digits gives 20513042.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1334 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (2110050).

Almost surely, 2^20513042 is an apocalyptic number.

20513042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20513042 is a deficient number, since it is larger than the sum of its proper divisors (13247758).

20513042 is a wasteful number, since it uses less digits than its factorization.

20513042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20513042 is about 4529.1325880349. The cubic root of 20513042 is about 273.7432104958.

Adding to 20513042 its reverse (24031502), we get a palindrome (44544544).

The spelling of 20513042 in words is "twenty million, five hundred thirteen thousand, forty-two".