20623780 has 12 divisors (see below), whose sum is σ = 43309980. Its totient is φ = 8249504.

The previous prime is 20623777. The next prime is 20623807. The reversal of 20623780 is 8732602.

It can be written as a sum of positive squares in 2 ways, for example, as 10549504 + 10074276 = 3248^2 + 3174^2 .

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, 515575 + ... + 515614.

It is an arithmetic number, because the mean of its divisors is an integer number (3609165).

Almost surely, 2^20623780 is an apocalyptic number.

20623780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20623780 is an abundant number, since it is smaller than the sum of its proper divisors (22686200).

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

20623780 is a wasteful number, since it uses less digits than its factorization.

20623780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031198 (or 1031196 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20623780 is about 4541.3412115806. The cubic root of 20623780 is about 274.2349202714.

The spelling of 20623780 in words is "twenty million, six hundred twenty-three thousand, seven hundred eighty".