20700215 has 16 divisors (see below), whose sum is σ = 26306400. Its totient is φ = 15593472.

The previous prime is 20700193. The next prime is 20700217. The reversal of 20700215 is 51200702.

It is a cyclic number.

It is not a de Polignac number, because 20700215 - 2¹² = 20696119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20700193 and 20700202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700217) 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, 17771 + ... + 18899.

It is an arithmetic number, because the mean of its divisors is an integer number (1644150).

Almost surely, 2^20700215 is an apocalyptic number.

20700215 is a deficient number, since it is larger than the sum of its proper divisors (5606185).

20700215 is a wasteful number, since it uses less digits than its factorization.

20700215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20700215 is about 4549.7488941699. The cubic root of 20700215 is about 274.5732886372.

Adding to 20700215 its reverse (51200702), we get a palindrome (71900917).

The spelling of 20700215 in words is "twenty million, seven hundred thousand, two hundred fifteen".