61600020 has 24 divisors (see below), whose sum is σ = 172480224. Its totient is φ = 16426656.

The previous prime is 61600009. The next prime is 61600039. The reversal of 61600020 is 2000616.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 513274 + ... + 513393.

It is an arithmetic number, because the mean of its divisors is an integer number (7186676).

Almost surely, 2^61600020 is an apocalyptic number.

61600020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61600020 is an abundant number, since it is smaller than the sum of its proper divisors (110880204).

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

61600020 is a wasteful number, since it uses less digits than its factorization.

61600020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026679 (or 1026677 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 61600020 is about 7848.5680222573. The cubic root of 61600020 is about 394.9362071845.

Adding to 61600020 its reverse (2000616), we get a palindrome (63600636).

The spelling of 61600020 in words is "sixty-one million, six hundred thousand, twenty".