11651620 has 24 divisors (see below), whose sum is σ = 25313400. Its totient is φ = 4499712.

The previous prime is 11651611. The next prime is 11651621. The reversal of 11651620 is 2615611.

It can be written as a sum of positive squares in 4 ways, for example, as 186624 + 11464996 = 432^2 + 3386^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11651591 and 11651600.

It is not an unprimeable number, because it can be changed into a prime (11651621) 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, 9465 + ... + 10624.

It is an arithmetic number, because the mean of its divisors is an integer number (1054725).

Almost surely, 2^11651620 is an apocalyptic number.

11651620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11651620 is an abundant number, since it is smaller than the sum of its proper divisors (13661780).

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

11651620 is a wasteful number, since it uses less digits than its factorization.

11651620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20127 (or 20125 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 11651620 is about 3413.4469382136. The cubic root of 11651620 is about 226.7055248644.

The spelling of 11651620 in words is "eleven million, six hundred fifty-one thousand, six hundred twenty".