20628735 has 16 divisors (see below), whose sum is σ = 34947936. Its totient is φ = 10354688.

The previous prime is 20628731. The next prime is 20628739. The reversal of 20628735 is 53782602.

It is an interprime number because it is at equal distance from previous prime (20628731) and next prime (20628739).

It is a cyclic number.

It is not a de Polignac number, because 20628735 - 2² = 20628731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20628696 and 20628705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628731) 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, 40194 + ... + 40703.

It is an arithmetic number, because the mean of its divisors is an integer number (2184246).

Almost surely, 2^20628735 is an apocalyptic number.

20628735 is a deficient number, since it is larger than the sum of its proper divisors (14319201).

20628735 is a wasteful number, since it uses less digits than its factorization.

20628735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80922.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20628735 is about 4541.8867224976. The cubic root of 20628735 is about 274.2568807659.

The spelling of 20628735 in words is "twenty million, six hundred twenty-eight thousand, seven hundred thirty-five".