20607780 has 48 divisors (see below), whose sum is σ = 60742080. Its totient is φ = 5205888.

The previous prime is 20607767. The next prime is 20607781. The reversal of 20607780 is 8770602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20607781) 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, 7899 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (1265460).

Almost surely, 2^20607780 is an apocalyptic number.

20607780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20607780 is an abundant number, since it is smaller than the sum of its proper divisors (40134300).

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

20607780 is a wasteful number, since it uses less digits than its factorization.

20607780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18108 (or 18106 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20607780 is about 4539.5792756598. The cubic root of 20607780 is about 274.1639844569.

The spelling of 20607780 in words is "twenty million, six hundred seven thousand, seven hundred eighty".