20513004 has 24 divisors (see below), whose sum is σ = 47945520. Its totient is φ = 6825984.

The previous prime is 20512991. The next prime is 20513011. The reversal of 20513004 is 40031502.

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, 8652 + ... + 10764.

It is an arithmetic number, because the mean of its divisors is an integer number (1997730).

Almost surely, 2^20513004 is an apocalyptic number.

It is an amenable number.

20513004 is an abundant number, since it is smaller than the sum of its proper divisors (27432516).

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

20513004 is a wasteful number, since it uses less digits than its factorization.

20513004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929 (or 2927 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20513004 is about 4529.1283929692. The cubic root of 20513004 is about 273.7430414611.

Adding to 20513004 its reverse (40031502), we get a palindrome (60544506).

The spelling of 20513004 in words is "twenty million, five hundred thirteen thousand, four".