20701580 has 24 divisors (see below), whose sum is σ = 46031328. Its totient is φ = 7793408.

The previous prime is 20701579. The next prime is 20701609. The reversal of 20701580 is 8510702.

It is an unprimeable number.

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, 30104 + ... + 30783.

It is an arithmetic number, because the mean of its divisors is an integer number (1917972).

Almost surely, 2^20701580 is an apocalyptic number.

20701580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20701580 is an abundant number, since it is smaller than the sum of its proper divisors (25329748).

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

20701580 is a wasteful number, since it uses less digits than its factorization.

20701580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60913 (or 60911 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20701580 is about 4549.8988999757. The cubic root of 20701580 is about 274.5793237484.

The spelling of 20701580 in words is "twenty million, seven hundred one thousand, five hundred eighty".