20628260420 has 12 divisors (see below), whose sum is σ = 43319346924. Its totient is φ = 8251304160.

The previous prime is 20628260381. The next prime is 20628260453. The reversal of 20628260420 is 2406282602.

It can be written as a sum of positive squares in 2 ways, for example, as 7338320896 + 13289939524 = 85664^2 + 115282^2 .

It is a super-3 number, since 3×20628260420³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515706491 + ... + 515706530.

It is an arithmetic number, because the mean of its divisors is an integer number (3609945577).

Almost surely, 2^20628260420 is an apocalyptic number.

20628260420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20628260420 is an abundant number, since it is smaller than the sum of its proper divisors (22691086504).

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

20628260420 is a wasteful number, since it uses less digits than its factorization.

20628260420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031413030 (or 1031413028 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 20628260420 in words is "twenty billion, six hundred twenty-eight million, two hundred sixty thousand, four hundred twenty".