19649562520 has 48 divisors (see below), whose sum is σ = 51429727440. Its totient is φ = 6736992192.

The previous prime is 19649562437. The next prime is 19649562521. The reversal of 19649562520 is 2526594691.

It is a super-2 number, since 2×19649562520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649562521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5010684 + ... + 5014603.

It is an arithmetic number, because the mean of its divisors is an integer number (1071452655).

Almost surely, 2^19649562520 is an apocalyptic number.

19649562520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19649562520 is an abundant number, since it is smaller than the sum of its proper divisors (31780164920).

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

19649562520 is a wasteful number, since it uses less digits than its factorization.

19649562520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10025312 (or 10025301 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

It can be divided in two parts, 19649 and 562520, that added together give a square (582169 = 763²).

The spelling of 19649562520 in words is "nineteen billion, six hundred forty-nine million, five hundred sixty-two thousand, five hundred twenty".