19701900 has 72 divisors (see below), whose sum is σ = 63346640. Its totient is φ = 5253120.

The previous prime is 19701893. The next prime is 19701901. The reversal of 19701900 is 910791.

It is a super-2 number, since 2×19701900² = 776329727220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (19701901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 949 + ... + 6348.

Almost surely, 2^19701900 is an apocalyptic number.

19701900 is a gapful number since it is divisible by the number (10) 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 19701900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31673320).

19701900 is an abundant number, since it is smaller than the sum of its proper divisors (43644740).

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

19701900 is a wasteful number, since it uses less digits than its factorization.

19701900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320 (or 7307 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 19701900 is about 4438.6822368807. The cubic root of 19701900 is about 270.0863921072.

The spelling of 19701900 in words is "nineteen million, seven hundred one thousand, nine hundred".