13770920 has 16 divisors (see below), whose sum is σ = 30984660. Its totient is φ = 5508352.

The previous prime is 13770863. The next prime is 13770929. The reversal of 13770920 is 2907731.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12096484 + 1674436 = 3478^2 + 1294^2 .

It is not an unprimeable number, because it can be changed into a prime (13770929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172097 + ... + 172176.

Almost surely, 2^13770920 is an apocalyptic number.

13770920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13770920 is an abundant number, since it is smaller than the sum of its proper divisors (17213740).

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

13770920 is a wasteful number, since it uses less digits than its factorization.

13770920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344284 (or 344280 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 13770920 is about 3710.9190236382. The cubic root of 13770920 is about 239.6924300789.

The spelling of 13770920 in words is "thirteen million, seven hundred seventy thousand, nine hundred twenty".