20820735 has 24 divisors (see below), whose sum is σ = 38866464. Its totient is φ = 10249920.

The previous prime is 20820731. The next prime is 20820757. The reversal of 20820735 is 53702802.

It is not a de Polignac number, because 20820735 - 2² = 20820731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20820699 and 20820708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820731) 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, 17211 + ... + 18380.

It is an arithmetic number, because the mean of its divisors is an integer number (1619436).

Almost surely, 2^20820735 is an apocalyptic number.

20820735 is a deficient number, since it is larger than the sum of its proper divisors (18045729).

20820735 is a wasteful number, since it uses less digits than its factorization.

20820735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35615 (or 35612 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20820735 is about 4562.9743589023. The cubic root of 20820735 is about 275.1051278504.

The spelling of 20820735 in words is "twenty million, eight hundred twenty thousand, seven hundred thirty-five".