20720620 has 24 divisors (see below), whose sum is σ = 46073664. Its totient is φ = 7800576.

The previous prime is 20720611. The next prime is 20720633. The reversal of 20720620 is 2602702.

It is a happy 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, 30132 + ... + 30811.

It is an arithmetic number, because the mean of its divisors is an integer number (1919736).

Almost surely, 2^20720620 is an apocalyptic number.

20720620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20720620 is an abundant number, since it is smaller than the sum of its proper divisors (25353044).

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

20720620 is a wasteful number, since it uses less digits than its factorization.

20720620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60969 (or 60967 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20720620 is about 4551.9907732771. The cubic root of 20720620 is about 274.6634781681.

The spelling of 20720620 in words is "twenty million, seven hundred twenty thousand, six hundred twenty".