20780070 has 32 divisors (see below), whose sum is σ = 50054112. Its totient is φ = 5521152.

The previous prime is 20780059. The next prime is 20780093. The reversal of 20780070 is 7008702.

It is a super-2 number, since 2×20780070² = 863622618409800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20780070.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8284 + ... + 10496.

It is an arithmetic number, because the mean of its divisors is an integer number (1564191).

Almost surely, 2^20780070 is an apocalyptic number.

20780070 is an abundant number, since it is smaller than the sum of its proper divisors (29274042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20780070 is a wasteful number, since it uses less digits than its factorization.

20780070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20780070 is about 4558.5162059600. The cubic root of 20780070 is about 274.9259084144.

Adding to 20780070 its reverse (7008702), we get a palindrome (27788772).

The spelling of 20780070 in words is "twenty million, seven hundred eighty thousand, seventy".