20079780 has 48 divisors (see below), whose sum is σ = 64256640. Its totient is φ = 4589568.

The previous prime is 20079779. The next prime is 20079781. The reversal of 20079780 is 8797002.

It is an interprime number because it is at equal distance from previous prime (20079779) and next prime (20079781).

It is not an unprimeable number, because it can be changed into a prime (20079781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23485 + ... + 24324.

It is an arithmetic number, because the mean of its divisors is an integer number (1338680).

Almost surely, 2^20079780 is an apocalyptic number.

20079780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20079780 is an abundant number, since it is smaller than the sum of its proper divisors (44176860).

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

20079780 is a wasteful number, since it uses less digits than its factorization.

20079780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47828 (or 47826 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20079780 is about 4481.0467527130. The cubic root of 20079780 is about 271.8022098699.

The spelling of 20079780 in words is "twenty million, seventy-nine thousand, seven hundred eighty".