20700513 has 6 divisors (see below), whose sum is σ = 29900754. Its totient is φ = 13800336.

The previous prime is 20700503. The next prime is 20700523. The reversal of 20700513 is 31500702.

It is an interprime number because it is at equal distance from previous prime (20700503) and next prime (20700523).

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 2782224 = 4233^2 + 1668^2 .

It is not a de Polignac number, because 20700513 - 2¹⁷ = 20569441 is a prime.

It is a super-2 number, since 2×20700513² = 857022476926338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20700503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1150020 + ... + 1150037.

It is an arithmetic number, because the mean of its divisors is an integer number (4983459).

Almost surely, 2^20700513 is an apocalyptic number.

It is an amenable number.

20700513 is a deficient number, since it is larger than the sum of its proper divisors (9200241).

20700513 is a wasteful number, since it uses less digits than its factorization.

20700513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300063 (or 2300060 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20700513 is about 4549.7816431121. The cubic root of 20700513 is about 274.5746062152.

The spelling of 20700513 in words is "twenty million, seven hundred thousand, five hundred thirteen".