20072690 has 48 divisors (see below), whose sum is σ = 40592664. Its totient is φ = 7138560.

The previous prime is 20072681. The next prime is 20072707. The reversal of 20072690 is 9627002.

It can be written as a sum of positive squares in 4 ways, for example, as 11703241 + 8369449 = 3421^2 + 2893^2 .

It is a super-2 number, since 2×20072690² = 805825767672200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

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 23 ways as a sum of consecutive naturals, for example, 63974 + ... + 64286.

Almost surely, 2^20072690 is an apocalyptic number.

20072690 is an abundant number, since it is smaller than the sum of its proper divisors (20519974).

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

20072690 is a wasteful number, since it uses less digits than its factorization.

20072690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20072690 is about 4480.2555730672. The cubic root of 20072690 is about 271.7702157524.

Adding to 20072690 its reverse (9627002), we get a palindrome (29699692).

The spelling of 20072690 in words is "twenty million, seventy-two thousand, six hundred ninety".