20859480 has 48 divisors (see below), whose sum is σ = 67794480. Its totient is φ = 5562432.

The previous prime is 20859479. The next prime is 20859521. The reversal of 20859480 is 8495802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28612 + ... + 29331.

It is an arithmetic number, because the mean of its divisors is an integer number (1412385).

Almost surely, 2^20859480 is an apocalyptic number.

20859480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20859480 is an abundant number, since it is smaller than the sum of its proper divisors (46935000).

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

20859480 is a wasteful number, since it uses less digits than its factorization.

20859480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57960 (or 57953 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20859480 is about 4567.2179715884. The cubic root of 20859480 is about 275.2756684727.

The spelling of 20859480 in words is "twenty million, eight hundred fifty-nine thousand, four hundred eighty".