31420620 has 144 divisors (see below), whose sum is σ = 118879488. Its totient is φ = 6526080.

The previous prime is 31420619. The next prime is 31420621. The reversal of 31420620 is 2602413.

It is a happy number.

31420620 is a `hidden beast` number, since 3 + 1 + 42 + 0 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (31420619) and next prime (31420621).

It is a super-2 number, since 2×31420620² = 1974510722368800, 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 = 31420593 and 31420602.

It is not an unprimeable number, because it can be changed into a prime (31420621) 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, 12727 + ... + 14993.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^31420620 is an apocalyptic number.

31420620 is a gapful number since it is divisible by the number (30) 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 31420620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59439744).

31420620 is an abundant number, since it is smaller than the sum of its proper divisors (87458868).

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

31420620 is a wasteful number, since it uses less digits than its factorization.

31420620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31420620 is about 5605.4098868861. The cubic root of 31420620 is about 315.5524696260.

The spelling of 31420620 in words is "thirty-one million, four hundred twenty thousand, six hundred twenty".