20513370 has 32 divisors (see below), whose sum is σ = 49455360. Its totient is φ = 5445440.

The previous prime is 20513341. The next prime is 20513371. The reversal of 20513370 is 7331502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20513371) 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, 5740 + ... + 8600.

It is an arithmetic number, because the mean of its divisors is an integer number (1545480).

Almost surely, 2^20513370 is an apocalyptic number.

20513370 is an abundant number, since it is smaller than the sum of its proper divisors (28941990).

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

20513370 is a wasteful number, since it uses less digits than its factorization.

20513370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 20513370 is about 4529.1687979142. The cubic root of 20513370 is about 273.7446695236.

Adding to 20513370 its reverse (7331502), we get a palindrome (27844872).

The spelling of 20513370 in words is "twenty million, five hundred thirteen thousand, three hundred seventy".