620404020 has 144 divisors (see below), whose sum is σ = 1923841920. Its totient is φ = 161803008.

The previous prime is 620403991. The next prime is 620404021. The reversal of 620404020 is 20404026.

620404020 is a `hidden beast` number, since 620 + 4 + 0 + 40 + 2 + 0 = 666.

It is a super-2 number, since 2×620404020² = 769802296064320800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 620403984 and 620404002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620404021) 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, 2020707 + ... + 2021013.

Almost surely, 2^620404020 is an apocalyptic number.

620404020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620404020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961920960).

620404020 is an abundant number, since it is smaller than the sum of its proper divisors (1303437900).

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

620404020 is a wasteful number, since it uses less digits than its factorization.

620404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 620404020 is about 24907.9107915538. The cubic root of 620404020 is about 852.8870777989.

Adding to 620404020 its reverse (20404026), we get a palindrome (640808046).

The spelling of 620404020 in words is "six hundred twenty million, four hundred four thousand, twenty".