20740780 has 24 divisors (see below), whose sum is σ = 45848880. Its totient is φ = 7859520.

The previous prime is 20740777. The next prime is 20740781. The reversal of 20740780 is 8704702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26911 + ... + 27670.

It is an arithmetic number, because the mean of its divisors is an integer number (1910370).

Almost surely, 2^20740780 is an apocalyptic number.

20740780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20740780 is an abundant number, since it is smaller than the sum of its proper divisors (25108100).

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

20740780 is a wasteful number, since it uses less digits than its factorization.

20740780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54609 (or 54607 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20740780 is about 4554.2046506498. The cubic root of 20740780 is about 274.7525266761.

The spelling of 20740780 in words is "twenty million, seven hundred forty thousand, seven hundred eighty".