20077820 has 24 divisors (see below), whose sum is σ = 48187104. Its totient is φ = 6883776.

The previous prime is 20077817. The next prime is 20077853. The reversal of 20077820 is 2877002.

It is a self number, because there is not a number n which added to its sum of digits gives 20077820.

It is a congruent 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, 71567 + ... + 71846.

It is an arithmetic number, because the mean of its divisors is an integer number (2007796).

Almost surely, 2^20077820 is an apocalyptic number.

20077820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20077820 is an abundant number, since it is smaller than the sum of its proper divisors (28109284).

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

20077820 is a wasteful number, since it uses less digits than its factorization.

20077820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143429 (or 143427 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20077820 is about 4480.8280484750. The cubic root of 20077820 is about 271.7933659871.

The spelling of 20077820 in words is "twenty million, seventy-seven thousand, eight hundred twenty".