20513734 has 8 divisors (see below), whose sum is σ = 30800088. Its totient is φ = 10247040.

The previous prime is 20513729. The next prime is 20513767. The reversal of 20513734 is 43731502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20513699 and 20513708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1947 + ... + 6694.

It is an arithmetic number, because the mean of its divisors is an integer number (3850011).

Almost surely, 2^20513734 is an apocalyptic number.

20513734 is a deficient number, since it is larger than the sum of its proper divisors (10286354).

20513734 is a wasteful number, since it uses less digits than its factorization.

20513734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9830.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20513734 is about 4529.2089817097. The cubic root of 20513734 is about 273.7462886704.

The spelling of 20513734 in words is "twenty million, five hundred thirteen thousand, seven hundred thirty-four".