20513703 has 24 divisors (see below), whose sum is σ = 32429808. Its totient is φ = 11496576.

The previous prime is 20513687. The next prime is 20513729. The reversal of 20513703 is 30731502.

It is a happy number.

It is not a de Polignac number, because 20513703 - 2⁴ = 20513687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20513703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6475 + ... + 9107.

It is an arithmetic number, because the mean of its divisors is an integer number (1351242).

Almost surely, 2^20513703 is an apocalyptic number.

20513703 is a deficient number, since it is larger than the sum of its proper divisors (11916105).

20513703 is a wasteful number, since it uses less digits than its factorization.

20513703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703 (or 2696 counting only the distinct ones).

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

The square root of 20513703 is about 4529.2055594773. The cubic root of 20513703 is about 273.7461507768.

The spelling of 20513703 in words is "twenty million, five hundred thirteen thousand, seven hundred three".