51620205 has 48 divisors (see below), whose sum is σ = 102245760. Its totient is φ = 21775104.

The previous prime is 51620197. The next prime is 51620209. The reversal of 51620205 is 50202615.

It is not a de Polignac number, because 51620205 - 2³ = 51620197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16291 + ... + 19199.

It is an arithmetic number, because the mean of its divisors is an integer number (2130120).

Almost surely, 2^51620205 is an apocalyptic number.

It is an amenable number.

51620205 is a deficient number, since it is larger than the sum of its proper divisors (50625555).

51620205 is a wasteful number, since it uses less digits than its factorization.

51620205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950 (or 2937 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51620205 is about 7184.7202450757. The cubic root of 51620205 is about 372.3401833830.

The spelling of 51620205 in words is "fifty-one million, six hundred twenty thousand, two hundred five".