20510124640 has 96 divisors (see below), whose sum is σ = 51646279104. Its totient is φ = 7670169600.

The previous prime is 20510124637. The next prime is 20510124653. The reversal of 20510124640 is 4642101502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385752 + ... + 435688.

It is an arithmetic number, because the mean of its divisors is an integer number (537982074).

Almost surely, 2^20510124640 is an apocalyptic number.

20510124640 is a gapful number since it is divisible by the number (20) 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 20510124640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25823139552).

20510124640 is an abundant number, since it is smaller than the sum of its proper divisors (31136154464).

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

20510124640 is a wasteful number, since it uses less digits than its factorization.

20510124640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50120 (or 50112 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 20510124640 in words is "twenty billion, five hundred ten million, one hundred twenty-four thousand, six hundred forty".