61020220 has 12 divisors (see below), whose sum is σ = 128142504. Its totient is φ = 24408080.

The previous prime is 61020209. The next prime is 61020221. The reversal of 61020220 is 2202016.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61020220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61020221) 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, 1525486 + ... + 1525525.

It is an arithmetic number, because the mean of its divisors is an integer number (10678542).

Almost surely, 2^61020220 is an apocalyptic number.

It is an amenable number.

61020220 is an abundant number, since it is smaller than the sum of its proper divisors (67122284).

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

61020220 is a wasteful number, since it uses less digits than its factorization.

61020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051020 (or 3051018 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 61020220 is about 7811.5440215107. The cubic root of 61020220 is about 393.6932085725.

Adding to 61020220 its reverse (2202016), we get a palindrome (63222236).

The spelling of 61020220 in words is "sixty-one million, twenty thousand, two hundred twenty".