20501715620 has 24 divisors (see below), whose sum is σ = 44925499584. Its totient is φ = 7844134496.

The previous prime is 20501715617. The next prime is 20501715653. The reversal of 20501715620 is 2651710502.

It is a super-4 number, since 4×20501715620⁴ (a number of 42 digits) contains 4444 as substring.

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, 22284014 + ... + 22284933.

It is an arithmetic number, because the mean of its divisors is an integer number (1871895816).

Almost surely, 2^20501715620 is an apocalyptic number.

20501715620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20501715620 is an abundant number, since it is smaller than the sum of its proper divisors (24423783964).

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

20501715620 is a wasteful number, since it uses less digits than its factorization.

20501715620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44568979 (or 44568977 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 20501715620 in words is "twenty billion, five hundred one million, seven hundred fifteen thousand, six hundred twenty".