20079440 has 20 divisors (see below), whose sum is σ = 46684884. Its totient is φ = 8031744.

The previous prime is 20079427. The next prime is 20079457. The reversal of 20079440 is 4497002.

It can be written as a sum of positive squares in 2 ways, for example, as 6031936 + 14047504 = 2456^2 + 3748^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125417 + ... + 125576.

Almost surely, 2^20079440 is an apocalyptic number.

20079440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20079440 is an abundant number, since it is smaller than the sum of its proper divisors (26605444).

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

20079440 is a wasteful number, since it uses less digits than its factorization.

20079440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251006 (or 251000 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20079440 is about 4481.0088149880. The cubic root of 20079440 is about 271.8006757683.

The spelling of 20079440 in words is "twenty million, seventy-nine thousand, four hundred forty".