20269780 has 24 divisors (see below), whose sum is σ = 45071208. Its totient is φ = 7630848.

The previous prime is 20269771. The next prime is 20269793. The reversal of 20269780 is 8796202.

It can be written as a sum of positive squares in 4 ways, for example, as 10942864 + 9326916 = 3308^2 + 3054^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29469 + ... + 30148.

It is an arithmetic number, because the mean of its divisors is an integer number (1877967).

Almost surely, 2^20269780 is an apocalyptic number.

20269780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20269780 is an abundant number, since it is smaller than the sum of its proper divisors (24801428).

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

20269780 is a wasteful number, since it uses less digits than its factorization.

20269780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59643 (or 59641 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20269780 is about 4502.1972413478. The cubic root of 20269780 is about 272.6568073171.

The spelling of 20269780 in words is "twenty million, two hundred sixty-nine thousand, seven hundred eighty".