20912045400 has 144 divisors (see below), whose sum is σ = 72830885400. Its totient is φ = 5576532480.

The previous prime is 20912045393. The next prime is 20912045501. The reversal of 20912045400 is 454021902.

20912045400 is a `hidden beast` number, since 209 + 1 + 2 + 0 + 454 + 0 + 0 = 666.

It is a super-2 number, since 2×20912045400² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 166545 + ... + 263744.

Almost surely, 2^20912045400 is an apocalyptic number.

20912045400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20912045400 is an abundant number, since it is smaller than the sum of its proper divisors (51918840000).

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

20912045400 is a wasteful number, since it uses less digits than its factorization.

20912045400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430320 (or 430299 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 20912045400 in words is "twenty billion, nine hundred twelve million, forty-five thousand, four hundred".