61530020 has 24 divisors (see below), whose sum is σ = 131035968. Its totient is φ = 24264800.

The previous prime is 61530011. The next prime is 61530041. The reversal of 61530020 is 2003516.

It is a super-2 number, since 2×61530020² = 7571886722400800, which contains 22 as substring.

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, 20246 + ... + 23085.

It is an arithmetic number, because the mean of its divisors is an integer number (5459832).

Almost surely, 2^61530020 is an apocalyptic number.

It is an amenable number.

61530020 is an abundant number, since it is smaller than the sum of its proper divisors (69505948).

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

61530020 is a wasteful number, since it uses less digits than its factorization.

61530020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43411 (or 43409 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 61530020 is about 7844.1073424578. The cubic root of 61530020 is about 394.7865534836.

Adding to 61530020 its reverse (2003516), we get a palindrome (63533536).

The spelling of 61530020 in words is "sixty-one million, five hundred thirty thousand, twenty".