20629971696 has 240 divisors, whose sum is σ = 58398119424. Its totient is φ = 6270649344.

The previous prime is 20629971653. The next prime is 20629971701. The reversal of 20629971696 is 69617992602.

It is a happy number.

It is a super-2 number, since 2×20629971696² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59452195 + ... + 59452541.

Almost surely, 2^20629971696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20629971696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29199059712).

20629971696 is an abundant number, since it is smaller than the sum of its proper divisors (37768147728).

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

20629971696 is a wasteful number, since it uses less digits than its factorization.

20629971696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 57.

The spelling of 20629971696 in words is "twenty billion, six hundred twenty-nine million, nine hundred seventy-one thousand, six hundred ninety-six".