20820070 has 16 divisors (see below), whose sum is σ = 39680928. Its totient is φ = 7838080.

The previous prime is 20820061. The next prime is 20820071. The reversal of 20820070 is 7002802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61066 + ... + 61405.

It is an arithmetic number, because the mean of its divisors is an integer number (2480058).

Almost surely, 2^20820070 is an apocalyptic number.

20820070 is a deficient number, since it is larger than the sum of its proper divisors (18860858).

20820070 is a wasteful number, since it uses less digits than its factorization.

20820070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122495.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20820070 is about 4562.9014891843. The cubic root of 20820070 is about 275.1021989295.

Adding to 20820070 its reverse (7002802), we get a palindrome (27822872).

The spelling of 20820070 in words is "twenty million, eight hundred twenty thousand, seventy".